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Mark, I've never used sealed lead acid batts (other than as a dink start batt). I've had flooded, gel and agm for the house. Perhaps when you deep cycle every day, one should expect a shorter life span, but I've always considered 5 yrs to be a minimum for a well maintained battery. If you recharge daily to 100%, I would think that qualifies.

Perhaps the SLA batts were more cost effective in the long run, if they were less expensive and proportionally gave up sooner. Are you happy with the performance, cost considered?
 

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I have gels for the house bank now. While we have very different usage, I did get 8 years out of the last set. It's my understanding that gels are especially good at multiple deep discharges. While I'm certain they cost substantially more, I would wonder if you would get lifetime efficiency. They also need zero maintenance. However, you need a charging system that knows the proper gel profile.
 
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