I have an on/off switch on my 2005 Hunter 36 which utilizes either battery 1 or battery 2. I did an overnight and started it on battery 1 and then switched to 2. I turned the toggle switch, for charging, whcih can be either 1, 2 or both to number 2. Late at night I noticed on the charger/inverter that the reading was in red so I switched to battery 1. To my surprise, it also registered red. It should have been fully charged as it was full when Ileft the slip off of the shore power. I did run both the freezer and the frig, along with GPS/autopilot. Am I doing something wrong here. Engine did start up in red zone and I motored in. Nothing in manual or inverter book. any thoughts would be appreciated. Acid level is good but I haven't cleaned terminals since I had boat. I'm going down to clean them. Maybe that is the problem but it seemed to happen awfully fast. thank you for thoughts.