I have a 2 bank 12/24 onboard charger. BPS brand. I run a 24 volt trolling battery. The directions say "allways hook the charger cables to a single battery even on 24 volt setup" ok... I understand that part. But can sombody tell me how that works? I mean batteries are wired + of one battery to - of other battery. So aint that going to get mixed up somehow charging with cables paralell and batteries in series? Understand the question? I was wondering how that works, maybe since motor not running then not really 24 circuit? anyway, in my quest to be a know it all I rate that like a microwave. I don't no much about it.