Hey, guys im telling you i keep my boat plugged in with the onboard charger the boat is new with new batterys. With the interstate battery im good for about 10 hour maybe 12 if the wind not blowing. My old boat if i used walmart batterys i may make a season out of them. I check the water every month I fish just about every day after work and every weekend im some where fishing a tournament or just fishing. I have never had much luck with batterys. Would love to know what the best is? Opitma are so high but why buy when the batterys in the boat are under warranty.