Archive forJanuary, 2016

Does cold weather affect a lipo’s performance

LiPo batteries are also known as lithium-ion polymer batteries. These kind of gens ace lipo batteries are rechargeable or secondary cell batteries. They are commonly utilized in phones, but can also be used in radio-controlled planes and other smaller electronics. These batteries may also be used someday to power electric cars.

Cold weather affects lipos, like other batteries, you will probably capacity to be down, and therefore duration to be down. If your model is set up to direct cooling air over the lipos in the summer then it’ll supercool them in the winter time, unless you make a change. What I do is to put aluminium tape over the inlet ducts that are there to provide that cooling air.

The Lipos themselves sit in a Liposack, with a number of chemical handwarmers to keep the worst of the chill off. One of those will give about 30 minutes of decent heat and so four of them last about as long as I want to be out in the very low temperatures. On returning home the crystallised chemical handwarmers are warmed up in a pan of boiling water up and they then revert to their liquid state for the next time .

There is a way to get more performance out of a LiPo battery; optimize the Starting Temperature. LiPo batteries have an “ideal output temperature”. The internal resistance is at its lowest when they’re ran with a starting temperature of around 100°F (38°C). A pack at a temperature of less than 50°F (10°C) (very cold pack) can show noticeably poorer performance until it warms up with use. In the winter time or in cold climates, it’s best to store packs in a heated indoor living space. For outdoor use in cold climates, you should pre-warm your packs to 90-100°F (32-38°C) before using them. But remember, 140°F (60°C) is the maximum safe temperature, and the pack’s temperature will increase when it’s used, so be careful not to pre-warm the pack up too much.

Tips for your Lipo batteries

There are a couple effective ways to do this. The most effective is to find a square heating pad that you can place in your battery bag at the bottom. The only issue here is you will need a power source, not always a choice when out on location.

The second method is the method I’ve used when I don’t have access to the generator or another plug in. These tire heaters work perfect to plug into a small lipo 5000mah and keep the batteries warm. Simply place your batteries on top of each element and choose a heat that won?ˉt melt the plastic. Also don’t forget to keep an alarm on the Lipo batteries

Disclaimer: you must make sure to attach the sensor to one of the pads so they don’t run on full power not stop. To do this, just poke two small holes through one of the pads and zip tie the sensor to it so it’s secure.This will help keep your batteries warm while out in weather normally too cold for Lipo batteries.

Best RC Lipo Battery for cold weather

Now available from Genstattu, a collection of high capacity, high drain, hard case LiPo batteries specially designed for use in RC cars and models where extreme power and rugged reliability is a must.

With discharge rates of 90-100C, capacities ranging from 4800-6000mAh and in a range of configurations the Extreme Track LiPo range comes as standard with Overlander’s unbeatable quality, true extreme power and excellent value for money.

Available now; a 4800mAh 2S 7.4v 90C Shorty pack, a 5800mAh 2S 7.4v 90C Saddle pack, and a 6000mAh 1S 3.7v 100C, all provided with tubes and necessary cabling!

This will help keep your batteries warm while out in weather normally too cold for Lipo batteries. Good luck, respond to the post with any questions!

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10C 15C 20C Lipos - What does the C mean

How quickly a battery can discharge is it’s maximum current capacity. Current is generally rated in C’s for the battery. C is how long it takes to discharge the battery in fractions of an hour. For instance 1 C discharges the battery in 1/1 hours or 1 hour. 2C discharges the battery in ? or half an hour. All RC batteries are rated in milli Amp hours. If a battery is rated at 2000 mAh and you discharge it at 2000mA (or 2 amps, 1 amp = 1000mA) it will be completely discharged in one hour. The C rating of the battery is thus based on its capacity. A 2000mAh cell discharged a 2 amps is being discharged at 1C (2000mA x 1), a 2000mAh cell discharged at 6 amps is being discharged at 3C( 2000mA x 3). I think gen ace lipo battery is best choice, they are the proffessional manufacturer of Lipo battery.

Currently LiPo technology does not allow currents as high as NiCad or NiMH batteries do. For this reason, this many LiPo batteries are put in parallel to increase the present capacity of the battery pack. When 2 batteries are wired positive to positive and negative to negative they become like one battery with double the capacity. If you have 2 lipo 3s 5000mah and you wire them in parallel then the result is the same as 14000mAh cell. This 5000mAh cell has the same C rating as the original 2000mAh cells did. Thus if the 5000mAh cells could discharge at a maximum of 5C, or 10 amps then the new 4000mAh cell can also discharge at 5C or (4000mA x 5) 20 amps. This method of battery pack building allows us to use LiPo batteries at higher currents than single cells could produce.

The naming convention that allows you to decipher how many cells are in parallel and how many are in series is the XSXP method. The number in front of the S represents the number of series cells in the pack so 3S means it’s a 3 cell pack. The number in front of P means the number of cells in parallel. So a 3S4P pack of 2100mAh cells has a total of 12 cells inside. It will have the voltage of any other 3S lipo pack since the number of cells in series determines the voltage. It will have the current handling of 4 times the maximum C rating of the 12 individual cells. So say our 3S4P lipo pack had a maximum discharge of 6C. That means that it has a nominal voltage of 10.8 volts (3×3.6) and a maximum discharge rate of 50.4 amps (2100mAh x 6Cx4P ).

The maximum continuous current delivering capability of a RC cars battery can be determined by multiplying the C-Rate X (mah of battery).

A 2000mah, 20C battery would be capable of delivering 40000ma (40A).
A 2000mah, 25C battery would be capable of delivering 50000ma (50A).

That’s in a perfect world - however, there are no standards for how a manufacturer/vendor decides how to C-Rate their batteries. The big boys like Enerland probably do a good job of accurately descrbing the C-rate. Other pack makers may be another matter. They may call a real 15C pack a 25C pack in order to sell more. You just have to go by the RCG reports on the packs to get some idea on how accurate the C-rate is.

The other side of the coin is flight time. To get a 10 min flight, the average C-Rate draw needs to be 6C. A 20C pack operated at 20C will last a max of 3 min flight time and you’ll maybe get 50 cycles out of it at the best.

Here is a good rule of thumb to go by.

3min flight to 80% drain = 16c avg and it can peak 32c = use 30c+
4min flight to 80% drain = 12c avg and it can peak 24c = use 25c+
5min flight to 80% drain = 10c avg and it can peak 20c = use 20c+
6min flight to 80% drain = 8c avg and it can peak 16c = use 15-20c+
7min flight to 80% drain = 7c avg and it can peak 14c = use 15c+

For me, high C-rates (>15) have no value as I want at least 8-10 min flight time. However, I’ll take them if the price differential is small as it generally means a battery with a lower IR.

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Proper Way to Disposal of Lithium Polymer Battery

To begin with, damaged lithium polymer batteries (and even undamaged ones) can be extremely dangerous. The horror stories are very well-known, but new RC hobbist typically don’t come across good info on proper handling, storage, and disposal of lipos until well after they’ve begun their journey into the hobby. Usually, it takes a search for “why is my lipo so swollen?” before people get the spiel about the dangers of lipos. The scary part is that most people would have squeezed and poked at the RC lipo before they ever do the research. And typically, if you’re new, you’re doing some crashing and hard landings that bang the battery up even more.

The most important part of lipo disposal is to make the lipo safe, safe to be crushed in a garbage truck or safe when tossed in the recycle bin. We do not want to pass off a potentially dangerous lipo to people that do not understand what it is or how to handle it. As such I believe we have a responsibility to make them safe before they leave our care.

So, what is the safest way to dispose of LiPos? Enter the humble incandescent 12 volt automobile taillight bulb. If you have any skill at all at soldering (and you’ll need it anyway if you do anything with electric RC) it’s very easy to solder some wire to the contacts of a 12 volt automobile taillight, add whatever your battery connector of choice is to the other end and insulate it with electric tape or heat shrink. To dispose of your battery, just plug the battery into the taillight, put it somewhere where it’s safe (I use the holes in a cinderblock with a plastic baggie full of sand above - if the battery blows the baggie will melt and the sand will pour over the battery) and leave it until the bulb goes out. Then leave it for some hours more, check the voltage to make sure the battery is completely discharged, cut of the battery connector, strip the wires and twist them together. Then dispose or recycle the now completely safe battery. A single taillight bulb will work for up to a 11.1v lipo pack of any size, use two taillights in series for 4S lipo battery or more.

Here recommend Brand Lipo battery for you

Trust the battery that consistently delivers peak performances even through the roughest conditions. The Gens Ace 40C 4S 5000mAh 7.4 lipo battery pack has a high-capacity, high-discharge rate that gives you the power and run-time you expect from all Gens Ace batteries. This battery includes not only plug adaptors to fit Deans, Traxxas, Tamiya and EC3 plug types, but also heavy-duty features like 12 AWG soft silicone wire leads and our patented High Current Universal Plug System.

Gens Ace warrants this product to be free of material and workmanship defects when new. This product has been checked for proper functionality and inspected before leaving the factory. All Gens Ace batteries are warranted against the following: DOA (Dead on Arrival) cell or pack, swollen or puffed pack upon arrival, loose or broken solder joints, and wires or plugs on arrival.

Home made battery disposal

The first task is to drain the battery to 0V as Lithium polymer batteries are safe if carrying no voltage then you need to ensure no more charge can build up, the following will guide you through it.

  • Grab a bucket of sand and place it outside with the battery inside.
  • Connect an led or small lamp to the battery and drain it completely, leave connected for 1 day after the led stops glowing.
  • Cut the connectors off the battery.
  • Strip the wires
  • Join the red and black wires to create a short circuit and prevent any build up of voltage.
  • LiPo Battery successfully stabilised and you can safely dispose in the regular trash.

A slow discharge produces less heat and is much more safer then draining the battery fast with a motor or high load connection.

Hopefully I have dispelled the myth of salt water LiPo disposal, and I hope that this helps people who are looking for a safe way to dispose of their LiPos.

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How to Choose and Where to Buy Lipo Batteries

Given the wide range of actuators and electronics which go into a RC model, choosing the right battery may not be an easy task. This article guides you through the thought processes involved in choosing one or more RC car lipo for your RC models. We’ll start with an example:

7.4v (2S) 2200mAh 25C

Seems confusing, but it’s not.

7.4v: This refers to the voltage of the entire pack. Since each cell holds 3.7v, this pack must have RC car lipo wired in series. Common pack voltages you’ll see for airsoft use will be 7.4v and 11.1v.

2S: This refers to the number of cells in the battery pack, and the fact that they are wired in series. If they were wired in parallel it would have said 2P instead.

2200mAh: As usual, this is the capacity of the battery in milliamp-hours. The larger the capacity, the longer the battery will last before needing to be recharged.

25C: We talked about this in part one. It’s the discharge rate. If you don’t remember what the discharge rate is all about please go straight to part one, do not pass Go, and do not collect anything but nasty looks from the gnomes who write these things.

Now let us look into what it is that we want out of the AEG we’re putting this into. If you’re looking to create an ROF beast, then an 11.1v battery is your goal. If you’re simply looking to replace that mini 8.4v or 9.6v NiMH or NiCad battery, then a 7.4v li-poly should fit the bill nicely. Your next concern is capacity. How do you determine the capacity you need? Well, it depends on a lot of things, and there is no real concrete answer to this.

If you have a gun that runs at a high fps, you’re going to need more capacity as it’s going to be used up more quickly. Now looking at reality, I’ve seen an m14 DMR running semi-auto only, go through 700 rounds and the 2200mAh li-poly battery was still almost full. Your real limiting factor here is space. You can use a battery as big as the space you have to fit it in, but you might want to consider using this battery in more than one gun, so you have to fit the smallest denominator.

Let’s look at the Gens ace brand li-poly battery that is available at Genstattu.com. The specs read as follows:

11.1v 1600mAh 12C

If you are using RC servos which operate at 4.8V to 6V nominal, an 11.1V LiPo will kill them, so you either need a separate battery or a voltage regulator. The C rating is the capacity and the discharge rating is normally provided as a multiple of the ‘C’ rating. The capacity relates to how long the robot will last. For example if your 11.1V battery has a capacity of 2000mAh (2Ah) and can discharge at 5C, that means it can discharge at 10A, which is more than enough for your motors.

Now let us look at a 7.4v li-poly made by Gens Ace for just $6 more:

7.4v 2200mAh 30C

Doing the math, you get a 66A continuous discharge capability! So sure, we drop back to 7.4v, but we’re back to supplying the motor and drivetrain the current it needs to run at 100%! So in this case, the 11.1 wasn’t a win because of its low C rating. Once you’ve decided on capacity and voltage, you need to consider the discharge rate carefully. As proven here, the low discharge rate is a real deal-breaker for the Firefox batteries!

Be careful when using 7.4V LiPo batteries with RC servos (which normally work best at 4.8V to 6V). LiPo batteries can normally discharge at high current (a meaure of the capacity). The higher the capacity, the longer the robot will run, but also the heavier the battery will be. For hexapods similar to Lynxmotion’s, a 2-4Ah battery is best, and you might get 15-20 minutes of use. 800mA won’t last too long.

Conclusion:

LiPo batteries have the potential to overtake NiMH batteries in general use in the next few years, quicker than any battery in history. It is certainly an exciting time for the hobby, and things are changing on a frequent basis. Just remember to have fun, and if you don’t know something, ask questions! The only dumb question is the one you don’t ask!

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What Lipo Battery to Buy and Why

Lithium-polymer batteries are the fourth most like type of battery to be commercialized for EV applications. The discovery of nonmetallic solids capable of conducting ions has allowed has allowed for the development of these batteries. Lithium-polymer batteries have anodes made of either lithium or carbon intercalated with lithium. One candidate cathode under evalution contains vandadium oxide. This particular battery chemistry has one of greastest potentials for the highest specific energy and power. Unfortunately, design challenges assoicated with kinetics of the battery electrodes, the ability of the cathode and anode to absorb and release lithium ions, has resulted in lower specific power and limited cycle life for lithium-polymer batteries.

This guide is intended for the new user that wishes to start in the RC world and needs a basic knowledge about Lithium Polymer batteries.

Single cell battery packs

Each cell is rated at 3.7v nominal voltage. Why nominal? Because a fully charger cell has 4.2v and a fully discharged one will have about 3.5v. A RC car lipo is usually comprised of lipo battery that has the negative(black) and positive(red) wires hard soldered to its terminals and these wires are used for powering up the system.Depending on the battery make and purpose this might also be used for charging the battery.

In some cases a different connector will be used for charging. The battery in the picture shows the same cell made by the same manufacturer but with different cables used for different interfaces. The cell is a Turnigy Nanotech  750mAh 35C 11.1v lipo battery constant discharge with 70C burst discharge. Weighing only 19 grams this battery will keep a Syma X5C with an all up weight of 100 grams flying for about 10 minutes.

Multiple cell battery packs

The image on the right shows what you will typically find in a multi cell battery. All the cells are stacked together wrapped in plastic. The cells are wired in series and this gives the name and the voltage of the battery pack. In this configuration the voltage adds up and the capacity remains the same as the individual cell. So a 3S battery will have 3×3.7v=11.1v. This is the usual type of configuration and you might find it marked as 3S1P. Where the first 2 characters (3S) represent the number of cells and the last 2 characters (1P) represents how many packs are inside a battery. If you connect 2 3S batteries in parallel you will have a 3S battery with 2 times the capacity. This is a 2 pack battery and the marking for it would be 3S2P. More than one pack is not very common so this type of marking is not widely used but you might run across it when looking for dedicated receiver battery packs. This is the principle that works with all the range of battery packs.

Usual configurations are as follows:

3.7 volt battery = 1 cell x 3.7 volts (1S)
7.4 volt battery = 2 cells x 3.7 volts (2S)
11.1 volt battery = 3 cells x 3.7 volts (3S)
14.8 volt battery = 4 cells x 3.7 volts (4S)
18.5 volt battery = 5 cells x 3.7 volts (5S)
22.2 volt battery = 6 cells x 3.7 volts (6S)
29.6 volt battery = 8 cells x 3.7 volts (8S)
37.0 volt battery = 10 cells x 3.7 volts (10S)
44.4 volt battery = 12 cells x 3.7 volts (12S)

Capacity or mAh Rating

The best way to explain this is that the more milliamperes the battery stores after a full charge the more it will be able to keep your model running.

So the next thing would be to think “Hey i want my plane to fly for longer i’ll just put a higher capacity battery inside!”. Well, there is a catch. The higher the mAh rating is, the cells get bigger in size and weight also. So if your plane flies 8 minutes with a 2000mah battery it might fly for 10 minutes with a 2200mah battery but a 10000mah pack might be to heavy and the plane will not fly at all. This is where weight plays an important role. You need to be able to maintain the centre of gravity and also the ability of the model to lift, carry or float with the added weight.


Discharge rating

You can view the discharge rate as a container that has some mahs inside. This container has an opening on the bottom. The bigger the opening the faster the mahs flow out of it.

You should read the following if you do not want to destroy your batteries.

Following our example the 20C lipo battery will be able to provide 44000 milliamperes per hour or 44 Amperes.

If you want to calculate how long your model will run on this battery you can do the next calculation:

multiply the capacity by the maximum load of the battery
2200mah * 20C = 44000mah (these are milliamperes per hour)

Divide the result by 60 minutes

44000mah / 60 minutes = 733ma (power draw per minute)

Divide the capacity of the battery by the power draw per minute

2200mah / 733ma = 3.01 minutes

So from a theoretical point of view this battery will hold on for 3 minutes in a system that needs 44 amps to work normally.

If we put this battery in a flying wing that is powered by a NTM prop drive 2826 with a 8.5×6 propeller that needs about 4.0A to fly normally at around 50% throttle we will do the next calculation:

We need 4000mah lipo battery to operate the motor and we divide this by 60 minutes to find the power draw per minute

4000mah / 60 = 66.6ma per minute.

We then divide the capacity of the battery by the draw per minute result

2200mah / 66.6ma = 33.3 minutes (about 3 minutes and 20 seconds)

Here comes the 80% discharge rule:

This rule says that a lipo battery should never be discharged with more than 80% of its capacity.

So for a 2200mah battery this will be:

2200mah * 80 / 100 = 1760mah

At the end of the discharge cycle there should be 440mah still left in the battery.

This discharge limit will usually be about 3.7v per cell. Using a battery monitor will alert you when this limit is reached and you know when to bring your model back.

The C rating is important when you buy a lipo battery because if your system uses under normal load more than the constant discharge rate the battery will puff or swell, its internal resistance will rapidly deteriorate, the cells will become more and more unbalanced and the battery does not like that.

The bad things about Lipos

You might hear a lot of people saying that Lipos are dangerous, they explode, they swell, puff, make a lot of smoke not work for more than 10-15 times.It is true. If you mistreat them, Lipos are a waste of money.

Main causes of Lipo failure:

  • Overcharge
  • Over discharge
  • Not enough discharge rate
  • Charging the battery with fast chargers for too many times
  • Not using balance chargers
  • Running the battery at its full burst C rating repeatedly for more than 10 seconds.
  • Physical damage to the battery during landings or crashes
  • Short circuits in the system

Basically any abuse on the Lipo battery will decrease its life time. Serious abuse or damage can lead some times to  explosions, fire and aggressive swelling. Obviously there are those remote cases when the batteries have a manufacturing fault but usually these faults can be detected before or on the first use.

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How to Storage and Extend Your Lipo battery Life

Lithium polymer batteries (lipos) power our electric model airplanes. With sizable inventories of packs that represent a fair investment, getting the longest life out of our lipos is in our best interest. Two words: proper storage.
As lipo batteries age, their internal resistance rises. This causes the voltage to drop under load, reducing the maximum current that can be drawn.Additionally as lipos age, usable capacity is lost. Typically once a battery has lost 20% of its rated capacity it considered at the end of its useful life. It’s a fact, lipos age and degrade even during non-use. What can we do to minimize these effects? Manage two factors that are totally in our control: cell storage voltage and storage temperature. At first, we can here recommend you Gens Ace RC battery. And we will introduce the Gens Ace battery storage for you.
Gens Ace & Tattu is a professional Lipo battery manufacturer and exporter in China.
Genstattu.com offer a wide range of RC product including RC car battery, RC Helicopter Battery and RC , and RC TX/RX battery. Our RC batteries ranges from 3.7v to 22.2v, there are 1s lipo battery, 2 cell lipo batteries, 11.4v lipo, ect. We also supply 4000mah lipo battery, 5000mah lipo battery, 10000mah lipo battery, if you can’t find the battery you want, you can contact our customer service.
Storage Voltage:
A fully charged lipo cell is approximately 4.2 volts. Lipos are different from other battery chemistries as they should never be stored fully charged. Lipos should be stored approximately “half full”. Many of the newer lipo balance chargers have a“Storage Mode” which charges the pack to the proper reduced voltage state for storage purposes. The popular FMA CellPro charger charges cells to 3.85Vdc in Storage Mode. Check your charger manual, some chargers can both discharge the pack and then charge up to the storage level, while others can only charge up to the storage level.The later type charger requires you to discharge the pack below the storage level to take advantage of the storage feature. Storing your packs at the proper voltage level is the simplest thing you can do to lengthen their usable life span (assuming proper application and use). Storage is not just “over the winter”. If you only fly on the weekends, your packs are technically in storage all week, week after week during the entire flying season. Those cumulative hours can add up slowly degrading your packs.
Temperature:
Lipo batteries function via a chemical reaction that occurs inside their sealed foil envelopes. Providing power is a chemical reaction, while the aging/degrading process is another chemical reaction. If you remember back to high school chemistry, a chemical reaction doubles its speed for every ten degrees increase of ambient temperature. This is why lipos don’t perform as well in cold weather. The cold “slows down” the chemical reaction process. But this fact can work in our favor when it comes to lipo storage. Reducing the storage temperature slows the chemical reaction of the aging/degrading process. There is a limit as to how cold is OK. Lipos don’t want to be frozen solid, but keeping them cool during storage is most certainly in our favor. It turns out the typically household refrigerator (37 to 40 degrees) is the perfect storage place.
The following are 4 tips for Extending Lifespan of Lipo Batteries
1.During storage periods, keep your lithium battery at a 40% charge state.
Although it’s best to fully charge a lipo battery before use, prior to storage of Lithium polymer batteries it’s harmful to fully discharge them. The best battery manufacturers store lithium batteries at around 60 degrees and at a 40% charge level. The 40 percent charge allows a stable condition even if it means a level of self-discharge. Some reserve charge is necessary to keep a battery and its protection circuit operational during long periods of storage.
2. Never leave your Lipo battery at an elevated temperature.
Lithium ion batteries do not like heat. By leaving a lithium battery at a constant high temperature, their lifespan, run time and charge capacity reduce significantly. This is particularly true for laptop computers. Laptops produce heat. If you treat your laptop as a desktop replacement and use it as a main power source for a period of one year, the RC airplane batteries capacity could fall to 60% of its original max capacity and lead to a greatly reduced battery life performance. This issue can be resolved by removing a lithium battery while using a corded power source.
3. Never overcharge your Lipo battery.
When a RC model is not in use, it’s best to remove the Lithium polymer battery from the RC model unit. It’s also best to remove the lithium battery when a RC car is running on a power adapter. If you have a spare Lithium polymer battery, use one for the RC unit and keep the other cool by placing it in a refrigerator.If you leave a lithium ion battery inside a digital RC battery compartment at all times, the battery will become unusable at a much faster rate. It’s best to give your digital RC a breather by removing the battery every time it’s not in use.
4. Avoid frequent full discharges of your Lipo batteries.
One of the great advantages of a lithium battery is it has no memory effect, which means recharging a partially charged lithium battery is not harmful. And partial discharges with frequent recharges are much healthier for a lithium battery than one long deep discharge. High discharge rates contribute to damage and strain on a lithium battery. But by charging lithium ion batteries at a slower charge rate and more frequently, you can expect the life of your Lipo battery to last much longer.
About Gens ACE & Tattu
Gens is specializing in R & D, design, production and sales of lithium polymer battery products. Located in one of the high-tech industrial centers of China, Shenzhen. Gens ACE & Tattu covers an area of 3,0000 square feet and has a staff of approximately 500 people. With good quality and perfect after-sales service, Gens Technology is enjoying a high reputation, and we sincerely welcome your visit.

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Gens Ace Lithium-Polymer Battery Safe Guide Instructions

Lithium-polymer batteries offer a variety of significant advantages over NiCd, NiMH and Lipo batteries for use in R/C electric devices. It is very important to have a good understanding of the operating characteristics of RC airplane battery - especially how to charge and care for them safely. Always read the specifications printed on the battery’s label and this instruction sheet in their entirety prior to use. Failure to follow these instructions can quickly result in severe, permanent damage to the batteries and its surroundings and even start a FIRE!

WARNING! Lithium-polymer batteries (LiPo) are entirely different than Nicd and NiMH batteries and must be handled differently as well. Gens Ace Racing will not be held responsible for any and all incidental damages and bodily harm that may result from improper use of Gens Ace brand lithium-polymer batteries. In purchasing these products, the buyer/user agrees to bear all responsibilities of these risks and not hold Gens Ace, its distributors (owners and employees) and/or retailers responsible for any accidents, injury to persons, or property damage. If you do not agree with these conditions, please return the battery to the place of purchase.

Gens Ace 4S
Before and after every use of your LiPo battery, inspect all cells in the pack as much as possible to ensure no physical damage or swelling is evident. Such signs can often indicate a dangerous problem exists with the battery that could lead to failure.

Battery Voltages, Ratings & Applications

LiPo batteries can be assembled in many configurations. Packs are most commonly found with cells assembled in series, normally denoted with an “S”. For example, 3 cells in series are often denoted as “3s 11.1v lipo battery”. Each LiPo cell has a nominal voltage rating of 3.7V (with a minimum recommended discharge voltage of 2.8V, and a maximum charge voltage of 4.20V). The more cells assembled in series, the higher the total voltage of the pack. But assembling in series does not affect the overall rated capacity of the pack as shown in the diagram on page 2.

Charging the Battery

IMPORTANT WARNINGS: Be sure to follow these important warning statements regarding the charging of LiPo batteries:

•NEVER LEAVE A LIPO BATTERY UNATTENDED AT ANY TIME WHILE BEING CHARGED!!
•NEVER charge a LiPo battery while it’s inside the model. A hot pack could ignite wood, foam, plastic, etc.
•NEVER charge LiPo batteries with a NiCd or NiMH peak charger!
ONLY use a charger specifically designed for LiPo batteries which can apply the “constant current /
constantvoltage” charge technique (cc/cv). MuchMore offers several LiPo compatible chargers (www.much-more.co.kr) which can be found at your local retailer.
•NEVER charge LiPo batteries at currents greater than the “1C” rating of the battery (“C” equals the rated capacity of the battery).
•NEVER allow LiPo cells to overheat at any time! Cells which exceed 140°F (60°C) during charge can and USUALLY WILL become damaged physically and possibly catch FIRE!! Always inspect a battery which has previously overheated and do not re-use if you suspect it has been damaged in any way.
•ALWAYS discontinue charging a LiPo immediately if at any time you witness smoke or see the battery starting to swell up. This may cause the battery to rupture and/or leak, and the reaction with air may cause the chemicals to ignite, resulting in fire. Disconnect the battery and leave it in a safe fireproof location for approximately 15 minutes.
•ALWAYS charge a LiPo battery in a fireproof location, which could be a container made of metal (such as an ammunition box), ceramic tile, or a bucket of sand. ALWAYS have an “ABC type” fire extinguisher available at all times.

Gens Ace provides lithium battery solutions to power your portable devices. We can help consumer and industrial companies to meet their design challenges with a wide range of standard products and easy customisation options.

Our Lithium Ion Polymer (Li-Po) and Lithium Ion (Li-Ion) battery technologies offer flexible, efficient and reliable solutions to your mobile power and back up power needs. Many of our cells are pre-certified to UL1642 or IEC62133. We can undertake these and other certification testing as required by our customers, including UN38.3 for transportation. The cell list you see on the site is only a selection of available products, which include very High Energy Density cells and High Current Discharge as well as High and Low Temperature Cells.

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Top 5 Benefits of Gens ACE Batteries

Lithium Polymer (Li-Po) battery has high power to weight ratio making it popular in electrical equipment and devices. Due to the compact size, weight and flexibility of remodelling in any shape and size, it is widely used in RC vehicles. Unmanned Air Vehicle (UAV) or drones are widely talked about for fun or by the military for special recon purposes. They come in different size and background according to its function. Manufacturers are always on the look to reduce weight to obtain more performance from the aircraft with the available power. In this case RC Helicopter Battery is used for an electrically driven UAV.
Gens ace battery
Pilot in command form the ground needs to know the amount of energy available in the battery to know the remaining flight time. A device must be integrated in the UAV to monitor the energy left and relay this information back to the ground. Power consumption varies with the change in the environment such as wind, temperature and also the flight time spent during climb, cruise and descent. Thus, it is essential to know the limit and capacity of a Lithium Polymer battery. 1s lipo batteries is now on hot sale, welcome to buy.
Gens ACE had very humble beginnings having been started out of a garage with the Gens Ace Temperature Monitor for nitro engines in 2001. In 2002 Gens ACE introduced it’s first NiMH and NiCD batteries. Back then, as is still true today, Gens Ace focuses on selling high quality LiPo batteries at realistic prices. Gens took on LiPo battery packs almost since the beginning when LiPo battery technology first began to make an impact on Radio Control vehicles about 7 years ago. Since then we’ve carried a variety of packs for all your RC needs big and small, land, sea and air. Gens have evolved with the technology in these few short years and the results show. Gens Ace are one of the top selling brands of rechargeable RC battery packs in North America and our products are found in more than 50 counties globally.
Gens ace
Top 5 Pros of Gens Ace Batteries
The following top five benefits distinguish Gens batteries.
1. Gens Power Packs Have Patented Adaptability
Gens’s patented UNI plug makes its LiPo, NiMH, and LiFe battery packs are extremely versatile. Designed to handle even high-current battery power,the UNI plug for Atomik brand RCs comes with adaptors that fit Traxxas,Deans, Tamiya, and EC3 toys, making tricky, DIY soldering of adapter plugs unnecessary.
2. Soft Silicone Wire Leads for High Performance Power
Gens uses soft silicone wire connectors. Because they are flexible, they are easily adaptable to various installations in tight spaces. Silicone is resistant to temperature extremes, minimizing meltdown risk and frost damage should the RC toy be left outdoors.
3. Gens’s Limited Lifetime Battery Replacement Policy
A company’s warranty policy often indicates the quality of its products. Gens offers an impressive lifetime replacement plan on every rechargeable RC battery pack it sells. The manufacturer pledges to replace or repair defective products free within the first year after purchase. Thereafter, purchasers have the option to replace a power pack for a new one of the same description and receive a 30 percent discount on the original purchase price.
4. Gens’s Sizable Selection
Gens’s battery selection features dozens of choices to suit just about any RC or Airsoft power supply demand. With three different types of batteries plus plenty of package configurations, Gens’s catalog offers virtually all of the options available for RC hobbyists.
5. Connectable RC Batteries for More Power
When powering a larger RC, connecting Gens battery packs in a series multiplies the voltage. The manufacturer makes this easier in two ways. First, Gens sells battery-wiring harnesses that have plug-in connectors for hooking power packs together. Secondly, the company offers discounts on multiple packs of its batteries, making it less expensive to ramp up the power.
Where to buy Gens Ace Battery?
You can search Gens Ace battery on “Google”, “Amazon”, or direct go to our website: http://www.genstattu.com/. If you want to focus on our new RC battery information, please follow our facebook Gens ACE Global .

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What You Should Know about Lipo Batteries Packs

Battery choice is import for both electric and nitro vehicles. They both need batteries to operate. In a eclectric vehicle the batteries propel the vehicle and power the steering. In nitro vehicles the batteries power the steering and throttle servos while the nitro or gas engine propels the vehicle.
gens ace 4000
Gens ace 4000mAh Lipo
In electric vehicles, the choice comes down to NiCd, NiMh and Lipo battery packs. NiCd and NiMH batteries have long been the workhorse of electric vehicles. They are simple to charge, maintain and also tend to have long lifespans. These batteries however have been steadily losing popularity to Lithium Polymer (Lipo) batteries. Lipo batteries tend to require more maintenance and special charging methods but offer users a more exciting experience with their perfromance. According to the Lipo voltage, Lipo batteries can divided ino to 3.7V lipo, 2 cell lipo battery, 11.1V, 14.8V and other type of batteries. These batteries are all common voltage we can see in the market.
Lipo batteries have revolutionized the capabilities of electric models in this hobby. One key example vehicles at extremely affordable prices such as Traxxas’ XO1 model which is a ready to run vehicle capable of traveling at 100 mph right out the box without any modification or Proboat’s Miss Geico 29 and Blackjack 29 which are capable of traveling at speeds of over 40 mph across the water. Here we can recommend you gens ace RC airplane battery , all batteries are tailored for various scales of the RC Models such as electronic cars, nitro cars, aero planes, vessels and also other models, toys, electric tools, electric bikes, electric autos, digital products etc.
Lithium Polymer (LiPo) batteries need to be charged only with a LiPo compatible Charger. Most LiPo batteries have two wires and connectors. One wire is the main wire which is used to connect the battery to the vehicle and charger. The other wire with the small white plug is the balance cord. The balance cord is used to charge each cell of the battery evenly. Lipo batteries require more care than conventional Nicd and NiMh batteries. To prevent damage to the battery it is recommended to never leave LiPo batteries connected to the vehicle or the charge when not in use. This can drain the battery down to a voltage in which you will be unable to charge the battery again.
Many but not all electoronics speed controls have low voltage cutoffs to prevent the batteries in the model from draining down below the preset voltage threshold that will damage your lipo battery. To prevent damage to the battery it is also recommended to never leave LiPo batteries connected to the vehicle or the charger when not in use. In an abundance of caution it is also a good idea to charge and store LiPo batteries in a flame retardant LiPo charging sack.

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What is the “C” Rating on RC Lipo Battery

“C” rating is a rating of how quickly energy can be discharged from a battery. The rating is combined with a battery’s capacity to find determine the maximum discharge. This is very important when you consider battery choices for your RC models, because these machines draw very high amps from the motors and it is easy to choose a rc helicopter batteries that can’t handle the currents required by brushless motors and steep-pitched props. This article mainy explains what “C” rating is, “C” calculation and the charging of C Ratings.

Gens Ace Traxxas LiPo

The “C” rating of a battery only specifies the amount of current a lipo battery RC can safely provide. So a 1000mah 10C 3s 11.1v lipo battery can safely provide 10 amps, a 1000mah 20C battery can safely provide 20 amps, etc. However it is the motor and it’s propellor that determines the amount of current that will be required. So if a given motor/propellor combination requires 10 amps and you use a battery that can provide 30 amps only 10 amps will flow in the circuit. Increasing the current capacity of the battery will not increase the current in the circuit.

Current in a circuit is determined by the voltage applied and the circuits electrical resistance. The motor/prop combination are the circuits primary resistance. The ESC has some resistance and the battery itself has some resistance. Since you are not changing the motor/prop or the ESC these resistances remain the same. So the only thing that can effect the circuit resistance is the battery. It’s resistance is so low as to be negligible. So even if your 25C battery has slightly lower internal resistance a negligible amount of current increase should be seen. Here we can recommend you Gens ace 5000mAh 40C 2S1P 7.4V Lipo Battery Pack, Gens ace rechargeable 2S car lipo battery with high capacity of 5000mAh & high burst power of 40C for 1/8 & 1/10 RC car model such as HSP 1:10, Emaxx,Bandit, Rustler version, HPI Strada XB 1/10 RTR Electric Buggy, Kyosho GP 4WD RACING TRUCK etc.

“C” Calculation:

To charge a 2100 mAh Li-Po at 1C or C/1, set the charger to charge at 2.1 Amps (mAh divided by 1000 to get amps). It’s that simple. So a 3200 mAh NiCad that can be charged at 2.1C would be charged at 2 and 1/10th times the battery aH rating (3.2 X 2.1 = 6.72 amps). Likewise, a trickle charge of C/10 for the same battery would be 1/10th of the “C” rating (3.2 / 10 = .32 Amps).

Chargings C Ratings

It is also important to consider C-rating when charging batteries. I always stick to the rule of thumb that you should charge your batteries at no more than 1C even if they are rated for a higher Charge c-rating. Zippy compacts are a good example of a battery that will work great until you start charging it at a high C-rating.

Charging these at a 5C charge rating will rapidly reduce their life because their cells become oxidized. The batteries say on them that they can be charged at a 1-5C rate, but my real life experience says otherwise.

As you can see, We Genstattu are well stocked with a wide variety of products for you to choose from. Every single one of our Lipo batteries packs a massive punch and will give you to days of endless fun. This is why you should not hesitate to get in touch with us today. Order your ideal RC battery and get your craft up and running without wasting another second.

This article comes from: http://www.rc-battery.com/bbs/?p=304

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