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How to make a lithium battery for an electric bicycle
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I once read you should only connect LiIon batteries in parallel of the same capacity and type. Something to do with uneven discharge and then charge between cells.
Bought one from Targus ages ago. kind of a disappointment. 9V cells are expensive an at most have 500mAh of juice on them. Typical phone has 1000mAh capacity battery, and the conversion is by no means efficient, so at most you get to charge about 1/4 battery on your phone.
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