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<blockquote data-quote="Slappy" data-source="post: 321404" data-attributes="member: 7608">I just went down the rabbit hole on this one. Ultimately decided to stick with Interstate flooded lead acid deep cycles.I considered switching to AGM to get away from having to check fluid levels. One problem is that while my on board smart charger can charge AGM batteries properly, the voltage supplied back by my main and kicker motors is 15 - 15.5 V which is higher than recommended for all of the AGM batteries I considered. While trolling battery bank is not connected to cranking battery, every marine smart charger manufacturer I looked at recommends against mixing battery types connected to the charger. Mine uses the same charging profile for all banks, so no option to use a flooded lead acid profile for 1 and AGM profile for others even if I wanted to disregard manufacturer recommendation.Everyone I know that has had problems with interstate batteries in the boat don't charge them immediately after using. The first thing you should do after parking the rig is plug it in every time. If you discharge deep cycles and wait days or weeks to recharge, don't blame the battery for short lifespan.</blockquote>

[QUOTE="Slappy, post: 321404, member: 7608"] I just went down the rabbit hole on this one. Ultimately decided to stick with Interstate flooded lead acid deep cycles. I considered switching to AGM to get away from having to check fluid levels. One problem is that while my on board smart charger can charge AGM batteries properly, the voltage supplied back by my main and kicker motors is 15 - 15.5 V which is higher than recommended for all of the AGM batteries I considered. While trolling battery bank is not connected to cranking battery, every marine smart charger manufacturer I looked at recommends against mixing battery types connected to the charger. Mine uses the same charging profile for all banks, so no option to use a flooded lead acid profile for 1 and AGM profile for others even if I wanted to disregard manufacturer recommendation. Everyone I know that has had problems with interstate batteries in the boat don't charge them immediately after using. The first thing you should do after parking the rig is plug it in every time. If you discharge deep cycles and wait days or weeks to recharge, don't blame the battery for short lifespan. [/QUOTE]

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