Quote:
Originally Posted by Daox
Can you elaborate on why this is necessary and what might happen if I don't do it?
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If you connect two batteries with significantly different states of charge and not enough series resistance, it would result in a large current flow as the voltages equalize.
To equalize them, just connect the batteries in parallel with jumper cables (they have enough resistance, especially the cheap ones) and connect a charger to the batteries.