I figure I can plug both batteries in serial to use my 12 volts charger. But since one of them show 0 volt, I think it is dead for good. But can I still plug it to charge the other to 6volts using the 12 volts charger? What about the methods to save dead batteries does it work?
The batteries are 6 volt golf cart type. I use them in 12 volt configuration ( serial plugged) in my boat.