Re: Battery life short? What to check?
All of the batteries in the same charging source should be of the same type. The reason is that AGMs and GEL and wet-cell batteries have different charging acceptance at different voltages. Mixing GEL and AGM (which is what you have done) will lead to shorter life of one or both.
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USCG Licensed OUPV Captain, ASA 101/103/104/105 Certified - Also certified in Recreational Marine Electrical Systems