Bama, You will get lots of opinoins on this one, but my practice has always been to plug up a charger as soon as I come off the water and get to spot where I can do it. I charge batteries until they are charged fully, and then unplug the charger. With my boat at home in the carport, I plug up one day during the week, to keep things topped off. I charge the night before fishing, and thats it. I do NOT think you need to leave a charge plugged up 24/7–even if the mfg. says it will handle it. Batteries will take so much charge and no more. Plus, if you are constantly plugged up, you run the risk of damage from a lightning spike or other surge issues.Just my thoughts, but Ive always done it this way, and have had zero issues with batteries in 40 years of fishing.Mike Whitten