You cannot use a 12 volt charger to charge 2.6 volt batteries. The 2.6 volt batteries will become hot, very quickly, and explode.
Two six volt batteries in series makes 12 volts so switch the charger to the 12 volt position.
No.
No you cannot.
You cannot do this. If it were a 36 volt charger you could connect three 12 volt batteries in series and charge all 3 at the same time. But this is a 32 volt charger which I have never heard of.
No,because they are to differnent types of batteries.
A twelve volt charger will charge twelve volt batteries only unless it has a feature that allows you to change the chargers voltage. But on fast or slow charge 12 volts is 12 volts so most 12 volt chargers are only good for 12 volt batteries.
No. You can only charge one 12 volt battery at a time or two 6 volt batteries wired in series at a time if you want to use that 12 volt charger.
Separate the 2 12 volt batteries and charge them individually.
No you cannot.
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.
If you have two 6 volt batteries you can take a jumper wire and connect the negative post on one battery to the positive post on the other battery then connect the remaining pos and neg posts to the 12 volt battery charger.
No, but you can charge each one individually without separating them from the series loop.