Raf Posted May 3, 2013 Report Share Posted May 3, 2013 (edited) I am replacing my cranking battery. This battery serves two purposes, it starts my motor (40hp) and also runs the rear graph, bilge and nav lights. I have a separate deep cycle (that's tired as well) for the trolling motor (55pd 12v) and graph up front. Should I be looking at a marine cranking battery, a combo cranking/deep cycle or just deep cycle. A small 24 series deep cycle is what was in there before. For the front, Deep Cycle only. 27 or 31 series? I am guessing the difference is how much reserve power I have. Edited May 3, 2013 by Raf Link to comment Share on other sites More sharing options...
bigbuck Posted May 3, 2013 Report Share Posted May 3, 2013 You are fine with another Group 24 CRANKING battery. If you were running a trolling motor then you go with a Deep Cycle. Hopefully your TM battery lasts this year for you. Link to comment Share on other sites More sharing options...
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