Learning the HARD way...
Join Date: Jan 2007
Location: Boston / Ft Myers Area
Thanked 99 Times in 96 Posts
Rep Power: 9
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 101/103/104/105/106/118 Certified Instructor - Also certified in Recreational Marine Electrical Systems