Making sure your connections are good and clean is also very very important, if you have batteries in parallel and your connections are not good, then you are going to wear down the battery with the best connection, that is why when I store my 6v batteries, I wire them up in a parallel string, but instead of connecting the charger to the first battery in the string, I connect it to the + post at one end and the negative post at the other end, each connection no matter how good, and each inch of cable no matter how large, has resistance.
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