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I also run a duel battery system, charging is controled by an ACR, one battery is just for the engine, the other for house loads.. because my run to the fishing ground is short, I fish at night and my engine is fitted with a 20 AMP alternator, my draw on the batteries often exceeds my input, i switched to AGM batteries when the wet cell batteries died (after 4 years).. AGM, have a higher amp acceptance rate than all other batteries and one of the lowest self discharge rate, they are tottlay sealed and can be mounted in any poistion except upside down...when I switched them out, i dropped from Group 27 to group 24... last season was the first one in memmory that i did not need to charge the house battery mid season.... when i put the charger on them this spring... they accepted next to nothing...that's never happend after a winter off...
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