The 12 volt battery has double the electromotive force of the 6 volt. Electromotive force is measured in volts.
None
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One is 9 volts and the other is 12 volts. They do not interchange!
you can just check it properly... (on every battery volt is surely given...)
Charge it with a 12 volt battery charger.
A battery has a voltage and can supply a certain current for a period of time. You could have a 12 V battery that can deliver 100 A of cranking current or one good for supplying 100 A for an hour.
No
12 volt
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.
No, a 12 volt charger will overcharge a 8 volt battery and destroy it.
The battery is a 12 volt.
No
Yes, a 12 volt battery will be damaged if charged with a 24 volt charger.