How can I determine what the voltage of a LiPo should be when at full charge? Specifically, what should the voltage at full charge for a 2200mAh 20c 3-cell LiPo be?
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The voltage of a LiPo battery at full charge can be calculated with the simple understanding that each cell in the battery should reach a peak voltage of 4.2V after charging. Using this, we can make the simple formula: $$ Voltage\ _{total} = 4.2V\ ⋅\ (number\ of\ cells) $$
For your specific battery, the 3 cells means it would be 4.2 x 3 = 12.6V at full charge