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Can battery be charged outside of case?

Looking to be able to charge my spare Mini batteries using a portable Li On charger. Is this possible? I am repairing ipod minis as a hobby and I have several batteries that I want to charge before I install them! Is this possible?

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Single cells can be charged using a regulated power supply set to a voltage of 4.2 V, and a current limit appropriate to the size of the cell you'd want to charge, say about 0.5C - which means, if your cell has a capacity of 1000mAh you'd set the current limit at 500mA. A seasoned electronics engineer could slap together such a circuit from parts in the junk drawer. Carefully check that the voltage doesn't drift upwards as the circuit warms up under load, and adjust accordingly if it does.

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