Bob Van Go
New Member
I have 2 100Ah AGM batteries, one is about 3 years old, the other new, and different brands, so likely different internal structures and charge/discharge rates. My understanding is that if I parallel them, one would likely be overcharged, and one undercharged, shortening the life of both batteries. I can live with that if there is no other danger. The overcharging possibility has me reluctant to hook them in parallel. I'd like to be safe, so is hooking the 2 in parallel ok, or should I just use a switch to switch between the two to keep it safe? Is there an automatic switch that would switch between the two when one is getting low? Or anything that can be done to make it safe in parallel? Thanks.