New boat owner. I have a '97 Bayliner Ciera with a battery charger installed. Just moved boat from Cape May two weeks ago. Went down this week and batteries were dead (no shoreline connected). I may end up replacing them since I dont know their age (surprised they went dead in two weeks), but I have a couple of questions. If your boat has a battery charger, where should my battery selector switch be when docked? 1, All, 2 or off. Was advised to keep it to ALL while boat at slip with shoreline connected so both would charge, but wont they charge with selector at off position? Also, how long can i keep it charging before i do batteries any damage by overcharging?