Quote:
Originally Posted by John F
Just curious, but I don't think the battery capacity is the important part, isn't it the battery output voltage?
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They are single cells, so with same chemistry the voltage is the same. The charging must suit the capacity, which is also related to the space. Generally the same size will be similar capacity and then the charging will work and be safe. Some cells have a charger/monitoring circuit board. It has to be the same kind of cell, so the voltage will be correct. They are mostly in the range of 3.6V to 4.2V depending on charge condition. Some will list the purely nominal 3.7V
You can feel edge with wires (if wired) to see if there is an integral PCB (circuit board). Some systems have a 3rd monitoring wire and some use 4 wires, with the extra pair as data from an on-the-cell PCB cpu.