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Separate the 2 12 volt batteries and charge them individually.
No, a 12 volt charger will overcharge a 8 volt battery and destroy it.
No.No.
Charge it with a 12 volt battery charger.
If you are asking the question, can you charge a 6 volt battery with a 12 volt charger, the answer is no.
Not on any modern car with a 12 volt system.
You would need a 24 volt charger. Connect them in parallel and you can charge them both with a 12 volt charger. Or disconnect them and charge each one separately.
A 12 volt battery charger is designed to charge 12 volt batteries.The answer to the Related Question explains how any battery charger works.
No
NoNo
No you cannot.
With a 12 volt battery charger that is made to plug into a 220 volt circuit.