... Is this possible? how would I wire one 12V battery to a series of three 12V batteries? Is there a relay circuit or some kinda switch setup I can install so that I can charge the 3 batteries with the old charger I have (36V) and then have an independent charger for the extra 12V battery??? maybe that is more complicated that just getting a 48V charger, ... or building one myself, is there a way I can modify a computer power supply to make a charger?
Main question I need answered... ---> How can I add one battery in parallel to one of the batteries that are in series with 2 other ones? I guess with diodes? Please help!!!