I had a similar problem
This spring mine did the same thing. My battery was warranted by Interstate so I took it over to them. They said they would put it on their charger with 5 other batteries. They said it would probably take 3 days to charge it. After 5 days they called and said it was ready and that it was taking a full charge and holding under load. I asked why this was and they could not give me a good answer. They did say that they see this kind of thing alot and that the battery is often times still good and many people just assume it has went bad. I havent had a problem with it in the last 4 trips with all electronics and livewell pumps running it seems to be functioning fine.
Hope this helps.
Bill
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