Hooked up to shore power, the batteries (new) were dead when I returned to my boat the next week. Happened again last week. All I thought I left on were the bilge pump and fresh water pump. Digging around under the cabin sole, the positive connection to the shower sump was broken.
The battery charger glows green and lights up a West Marine charger panel that says it is charging; but I still lose power.
I have not touched the breakers except to verify they are on.