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What type of deep cycle batteries? Wet or AGM/Gel? If wet, is there a possibility you have been overfilling them? It's the only thing I can think of in addition to the possibility of them getting too hot. I've had deep cycle AGM's (Fullrivers 2 x DC150 & 2 x DC90) in our bus for 5 years now, & hope to get another 5 years before they need replacing.
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