I do know what I need is a battery with the floater option in it. That way when I come home from fishing I can connect it and it will go into a full out charge then drop off til the battery is fully charged and shut down. If by chance it needs more charge it will come on and only give what is needed. BUT, what is a good one and how many amp charger should I get. I've seen them at Walmart for 17 bucks that is a 2 amp and one for 35 that is a 6 amp. Also Advance Auto has a 1.5 amp for 29 bucks. Which do you think I should purchase? Haven't found one over 6 amp though. Any thought on this people. I want to mount the charger onboard with a plug so all I have to do is plug the boat in. The battery is used for trolling motor, 2 lights and live well pump.