Charge Rate formula - RC Groups
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Feb 09, 2009, 12:03 AM
I can crash real good.

Charge Rate formula

Can someone point me to the thread that has the formula that tells how fast you can charge a lipo safely...
i.e. thunder power 1320 2s 7.4v
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Feb 09, 2009, 04:52 AM
Registered User
It's a very simple formula. Charge rate (mA) = battery capacity (mAh).

I.e. 1320mAh battery, charge rate 1320mA (or 1.32A)
2200mAh battery, charge rate 2200mA (or 2.2A)

You'll see people calling that a charge rate of C or 1C.

Feb 09, 2009, 06:37 AM
Surface, Air & Water Rc Toys..
freechip's Avatar
Some brands of lipo can be safely charged faster with proper charger/balancer, but that should be done by someone that knows all the IN & OUT of lipo charging and pratices safe lipo charging.
Feb 09, 2009, 08:01 AM
jackerbes's Avatar
Use the battery maker's recommendations for the charging rate. Here is what ThunderPower has to say about it:

"..(7) NORMAL CHARGING: The charge rate should not exceed 1C (one times the capacity of the battery, unless otherwise noted*). Higher setting may cause problems which can result in fire. For example: Charge a 730mAh battery at or below 0.73Amps. Charge a 5000mAh battery at or below 5Amps. Thunder Power packs with balancing connectors can be used with TP balancers for safer charging. For
more information, please visit:

*To charge at greater than 1C (no more than 3C): You must use a Thunder Power 1010C charger in conjunction with a Thunder Power Balancer (205 or 210) and data cable. Only ProLite 910, 1320, 2000 and 2100 cells qualify for charging up to 3C."

Note that *only* the top of the line ProLite cells can be charged at up to 3C. I still would not do it unless I was waiting to use the cell, it is going to take some life out of the battery and it just does not make sense to use high rates needlessly.


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