A lot of sailboats have deep cycle batteries and an engine battery. Both get charged at the same time when the engine is running. While at the dock, I bet most people will charge deep cycle and engine batteries at the same time, and float them once charge is complete with the same charger. Have there been any problems with this method? No one has said so as far as I know. I have read that an AGM battery can be overcharged with an ordinary charger as the voltage can be too high for them.
Last edited by LakeSuperiorGeezer; 12-01-2011 at 10:29 PM.