Im going to go to a 2 battery setup to run my 12v trolling motor to double the capacity. I know how to hook up the batteries in parallel. I use a portable charger to charge my batteries. My question is, When charging is it best to connect to the positive and negative of the same battery or do you connect to the positive of one battery and the negative of the other battery? Also when you connect the trolling motor the same thing, positive and negative of the same battery or positive of one and the negative of the other? Or does it even make a differance? Thanks guys , I appreciate any input you might have.