I need to buy a new starting battery for my bass boat. It tests ok, but if I fully charge it on Monday, by Wednesday it's started to lose the charge, and I don't trust it to run the electronics for a full day on the water and still start the boat.
I may only run the big motor for 30 minutes during the day, so that's all the alternator time it gets, and since all the electronics are on that one battery (two fish finders (front and rear), GPS, livewell) I need the battery to be a deep cycle unit with sufficient power to crank the engine at the end of the day.
At the moment, I keep jumper cables in the boat in case I need to jump the starting battery from the trolling batteries, but that means unwiring the trolling batteries since they are wired serially to provide 24 volts for the trolling motor.
Anyone have any experience with a starting/deep cycle marine battery that they can recommend?