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Same chemistry. It the weight (how much lead) that determines the capability of the battery. Whether there are 3 cells per case or 6 cells per case, doesn't matter in the long run. Because the space the fiber glass mats between the plate, a deep cycle AGM battery will have about 90% of the capacity of a flooded deep cycle. The big advantage of AGM batteries is the need no water and can be mounted in any position. Another plus is that a flooded battery should not be discharged below 50% of their amp-hour capability; where as, an AGM can be discharged to 70% below its amp-hour capacity with little damage. The self-discharge of flooded batteries is about three time that of AGMs so a FLA battery stored at 90 degrees will self-discharge to 50% in about 80 days where a AGM will last 9 months before it has self-discharged to 50% of capacity.
A starting battery has many thin plates of lead per cell to provide a large current for a short time; where as, a deep cycle has a few thick plates per cell to provide a small current over a long time.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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