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post #15 of Old 11-19-2012
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Re: Battery Sizing - am I crazy?

Originally Posted by SloopJonB View Post
I know Deep Cycle batteries are not supposed to be starting batteries but I've used them that way and got nine years out of one $75 one with no problems.
Not true...

Starting used as deep cycle = BAD
Deep cycle used as starting = No prob

Essentially the ONLY advantage to starting batteries is that they have more cranking camps for a particular size/weight. Given the deep cycle need for a usual boat versus it's engine size however there is usually no need for the extra CCA's.

From another thread:
Originally Posted by Main Sail
Trojan Battery does an excellent job:

"Q: Can I use my Deep Cycle battery as a starting battery?

A: Deep cycle batteries can be used for engine starting but starting batteries should not be used for deep cycle applications. A deep cycle battery may have less cranking amps per pound than a starting battery, but in most cases a deep cycle battery is still more than adequate for the purpose of starting an engine."
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