Make sure the battery is actually dead, or just too low for your charger to bring it back.
Most cheap chargers can't bring a 'dead' battery to life. Make sure you have a decent one with some kick to it.
I used a Wally-world battery in my last boat for 4 years before I traded it in with 0 issues. I did have a small solar panel keep it trickled when in the boat and I did take it out every winter and keep in at home on a computerized trickle charger when not in use.
Make sure to use a deep cycle or AGM battery and not use a 'maintenence free' battery. Maintence free batteries hate being deep cycled and will die if run down a couple times.
I'd load change it up (if possible) with a good charger and see if it holds. If not, then either trade it in and take advantabge of the warrenty or buy a decent AGM from SAM's club or other place. Stay away from the expensive AGM's like Odessy as their quaily has dropped in recent years.
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