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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 RC airplane batteries battery choices for your RC models, because these machines draw very high amps from the motors and it is easy to choose a battery 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 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 cheap lipo battery 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.

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