Batt. Problem
The batt you have even if it is out of warranty you should still have some prorate warranty left. I work for Interstate Battery and our marine batts have a 12mo free replacement with a prorated warranty after that. It could save you some money on the new batt. You will need eighther the recipt or the date code being punched out to prove batt age. I would replace it. It could fail any time, also over work the batt it is hooked to.
It is not enough that a man should toil and provide,but that he be granted the pleasure of fishing with a friend.