How long does it take for an 18v battery to charge
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Depends entirely on how much current you use to charge it.
chemical reactions take place in battery which reduce the charge.
The Playstation 3 wireless controllers stop working when the battery fails to take a charge because they operate on a charged battery.
Yes, but you cannot leave it for long periods of time or the battery will overheat and boil acid away. Normally a fully dead battery to a full battery should take about 2 hours to charge up at 40 amps.
no, if you charge 9 volt battery with 12 volt battery you will destroy 9 volt battery