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Old 06-26-2021, 01:27 PM   #1
Marco Flamingo
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Using Deep Cycle as Start Batteries

A current thread is discussing mixing start and house batteries, but I don't think it is dealing with an issue that I've been wondering about. I understand that LA start batteries have more plate surface and can put out a lot of juice. House batteries (deep cycle) have thicker plates and are designed to put out juice over time. But it would seem that once the house battery bank reaches a certain size the deep cycles could put out the cold cranking amps without a problem.

My 80 hp Leyman still had the old abandoned battery box next to it. Based on the size, it appeared to hold two Group 24 batteries (maybe Group 27). Probably one start and one deep cycle. My prior owner put in 4 Dyno GC batteries (in two banks) for a total of 520ah. He said, and I think he was right, that there was no longer a need for a separate starter battery.

At some point a large deep cycle battery bank would have the same plate area as a lone starting battery. Thus, no need for a start battery, right?
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