Can a 12v charger charge an 18v battery?
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In respect to this, can you charge a 14.4 V battery with a 18v charger?
18V is around the right voltage to charge 14.4V batteries from. However, you're probably seeing a charger intended for 18V batteries, which will actually be giving closer to 22-24V, too much for 14.4V batteries.
Furthermore, will a 12v charger charge a 36v battery? Contrary to what others have said, you cannot charge a completely depleted 36v battery to 12v and get a third of the voltage. 3x 10.7v is 32.1v so that is the minimum voltage for a completely 'dead' 36v battery. Your 12v charger will just kill it even deader!
Thereof, can a 12v charger charge a 24v battery?
Re: Charging 24V Bank With 12V Charger As long as there is no 24v circuit, i.e. the batteries are still conencted in series BUT nothing else is connected across them, yes, you should be able to charge each one, one at a time, from a 12v charger.
How can I charge my 18v drill battery without a charger?
Take two small batteries and connect the positive side of one with the negative side of another through the connecting wires. Use your electric tape to secure the connectors in place. Bend the connected batteries in a U shape. Connect the positive side of the series connection to the positive side of the drill battery.