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another battery question 2 deep cycle vs starting

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another battery question 2 deep cycle vs starting

Old 08-26-2017, 07:40 AM
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Default another battery question 2 deep cycle vs starting

Can you use 2 deep cycle batteries to match the CCA of a starting battery?

replacing my batteries, neighbor has 2 brand new Deep Cycle group 27 that he bought about a month ago (july 2017 stickers) but ended up not needing so they are just sitting on the shelf.

In the past I've always gone with 2 group 27 starting as replacements- since my boat is a diesel.

But wondering since I almost always run the boat on BOTH batteries- including on initial start up- I can get away with the 2 deep cycles to make up for the CCA amps (i.e, 2-540CCA deep cycle vs. 800CCA starting)
Old 08-26-2017, 08:51 AM
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If those the only 2 then no. You shouldn't need to use all your batteries to start your engine. Defeats the point of having 2.
Old 08-26-2017, 09:37 AM
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Yes. you can use deep cycle batteries (with sufficient CCA) as a starting battery. Just don't try using a starting battery in a deep cycle application. This, according to Trojan. And yes, paralleling them will increase CCA.

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