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DO NOT do this unless you put a large enough diode in series with the circuit to prevent any charge from getting back into the larger battery.
Once the system reaches equilibrium you will not be able to charge any further, i.e. it will never fully charge the smaller battery.
I think this is a horrible idea, it would be ten times more efficient and cost-effective to just get a second battery and use a good quality charger as they will prolong the life of your batteries, which I don't want to even think about how much damage recharging off another battery will do.
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