Different Brand Batteries in Parallel
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...
Forum Discussion
Generally, batteries in parallel should be the same type, size and age as an older, weaker, smaller battery will draw down a newer, stronger, larger battery to "equalize" the charge so you will not be getting the benefit of the newer battery. Best bet is to replace both at the same time with like batteries.
