I have two M27MF Delco 12v no-maintenance deep cycle batteries in parallel. I have used them this way for many years in our 16’ fishing boat mainly to crank the motor and run the trolling motor. The...
OP, even if they are not within 0.1 volts of each other and since it's in a boat... once charged, do not store them hooked together. You probably already have one of these.
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