3.7v 100mA/h battery
If it is a Li-Ion or Li-Po battery, you will need to make or get a special charger for it. You can't just hook up a solar cell and hope for the best.Generally for these two types of battery you want a charge current of 0.1C, in other words one tenth (0.1) of the capacity (C). For a 100mAh battery, this is approx 10mA.
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