Using a deep cycle battery for starting?
So I got a super deal on a Dyno group 27 deep cycle battery at a charity auction. I was about to go on a trip and all the batteries on the boat are dodgy. Starting is one group 24 car battery of old age. The house bank is 2 interstate 4Ds, one old, the other very very old. So I picked up the Dyno to have a reliable way to start the engine, installed it and isolated it from the other batteries. I didn't think it would be that big of a deal because I've seen many a large engine started with deep cycle 4d and 8d batteries.
Is there any fundamental problem with using a good quality deep cycle battery for starting? Seems to be man enough for the job so far. Will my battery die a premature death? Will I cook my starter for lack of available juice?
Aren't starting batteries built with thin plates because they're cheaper to make and "good enough", whereas a good deep cycle battery would be a better, longer lasting albet more expensive starting battery?
I have a sauna on my boat, therefore I win.
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