User Guide

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Guide to Lithium Polymer Battery’s

In any case, opinions will differ - some people do not bother to wait for 30-40

mins for a pack to charge, so they charge at high C rates, and replace their

packs more often. But it is better to have more battery packs per model, so

often you don't even need to charge at the field, so all of the charging is either

at 1C or 1.5C at the most. At the end the decision is up to you - whether you

want your batteries to last longer, or have fewer charges. There is one thing

that people should be careful about - when you receive your battery, if you

want to charge it at rates over 2C, make sure you KNOW for a fact that the

battery CAN handle more than 2C charge rates, otherwise you run the risk of

ruining it very quickly, or even making it to explode.

(The safest charge rate for most LiPo batteries is 1C, or 1 x capacity of

battery in Amps.)

Battery discharging

Now it’s time to discuss discharge rates. Some people, for some reason, think

that the battery's capacity or discharge rate should be used to limit motor

power, or also think that just using higher capacity batteries will overload the

motor!!! And here's why: in no universe should a battery's discharge rate be

used to regulate motor output!!!! This is wrong on so many levels

When we choose a model, unless it comes with the power system already

installed, we should choose the power system in the following order: first is the

motor, and preferably one that could provide sufficient power for the model,

then, and only THEN do we go about choosing an appropriate ESC and battery.

So here is an example - if the selected motor has a max amp rating

(that is the maximum amount of amps that the motor can SAFELY draw

continuously) of 20Amps, a 20Amp ESC would work, but preferably it

should be at least 25, or even 30Amps. The battery used for this motor

should be capable of providing around twice the maximum amp draw of

the motor: for a 20Amp motor, a suitable battery would be 2200mAh

20C, because it can provide max of 44Amps, which is twice what the

motor could ever draw.

While adhering to these principles, two things will always be a fact: under full

motor load, the battery will be strained at only 50%, which means less voltage

drop, which means more power goes to the motor, which translates into more

thrust, and the battery will not be over-stressed, will not overheat, will not puff

up, and generally will last MUCH longer. Trying to do the opposite - to limit

motor power by using a lower discharge rate battery - will end up over-

stressing your battery, it will puff up, and it will last only a few cycles. Not to

mention, that the motor will drop considerably, because the battery voltage will

drop very low, and will not provide enough power to the motor. As a general

thumb rule, try to use a battery that can provide twice as much current as the

motor can draw. This will ensure your battery's longevity and will definitely

improve the flight performance of your model.