On a car battery? on most battery chargers there are three settings trickle or something around 2 amps which will take a good 12 hours to 24 hours a second for small batteries which is a few more amps that could take anywhere from 6 to 12 hours and a fast charge which is even more amps and anywhere from 1 hour to 4 hours, also some chargers have a start option which cranks over a car so the alternator will charge it correctly, the trickle charge is the best charge but will take the longest
It takes between 8 and 12 hours to charge a 12 volt battery at 2 amps. The actual time will depending on how much charge is in the battery initially.
Charge it with a 12 volt battery charger.
No
No.
As long as the ATV is wired 12 volt, not 6.
approx 6hrs
About 2 hours if the battery is 100% discharged.
No, if they are wired in series you have 36 volts assuming each battery is a 12 volt battery. They will have to be wired in parallel to output 12 volts. In that case you can charge them with a 12 volt charger but it will take 3 times as long as charging just one 12 volt battery.
No, a 12 volt charger will overcharge a 8 volt battery and destroy it.
no it can't
No it will not work
8 hours