You have a issue some where to drain your batteries like that. When you say you have ipilot is it on a Terrova or on PDv2. If on PDv2 it needs to be disconnected. When you come in unplug it. On Terrova as soon as you stow motor it breaker the connection to batteries. If your doing it on a PDv2 just to store your track you are asking for trouble. That power going through the GPS and boards eventually is going to burn out something. You would be better off to buy a depth finder with gps to store you tracks. Then go to them and punching record a track once you get on that line every time you go fishing. I leave my charger plugged in if it’s not hooked to back of truck.