The 12 volt battery has double the electromotive force of the 6 volt. Electromotive force is measured in volts.
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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...)
You can differentiate between a 6-volt and a 12-volt system by checking the voltage with a multimeter; a 6-volt battery will read around 6 volts, while a 12-volt battery will read around 12 volts. Additionally, you can look at the battery's labeling or specifications, which typically indicate the voltage. Physical size can also be a clue, as 12-volt batteries are often larger and heavier than their 6-volt counterparts.
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 capacities of batteries are rated in amp hours. The higher the amp hour rating of a battery the longer the device connected to the battery will operate. Depending on what the connected load draw in amps is, will determine how long the connected device will operate.
The battery is a 12 volt.