Join Date: Aug 2008
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Mixing different AGM sizes and brands
I have a two bank battery set up with two group 27 Deka Seamate AGM's for the house bank, and one Deka 27 Seamate's for a starter. My starter battery just went bad and I was told by a marine surveyor and EE that I can replace the starter battery with a smaller size (group 24) instead of spending more for another group 27 battery. He told me that as long as they are all AGM's it won't be a problem in terms of charging. Therefore, I was thinking of replacing the starting battery with a Cabela's group 24 AGM (this should be powerful enough to start my Yanmar 2ym15 engine). Any thoughts on this?