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In a 2 batteries in series situation, each battery has a certain resistance. As they drain, that resistance goes up, which means they need more voltage to charge and take more amps to charge. If one of the two batteries in series is drained more than the other (if you tap one of the 12 volt...

RE: 12v Deep Cycle Battery Set-up for Camper on 24v Batteries change resistance as they charge. So you've got a problem with two different sized batteries connected in Parallel to each other. The Deep Cycles will charge at a different rate and their resistance will drop off as they charge...