John, The Charge Wizard plugs into a port on the Inteli-Power, so it can control whatever the Inteli-Power is attached to. According to the manual, the I-P can handle multiple batteries, even those of different capacities. Roger Roger Hightower, N7KT WBCCI 4165, VAC, TCT 1975 31' Sovereign, '02 F-250 PSD Mesa, AZ mailto:n7kt@att.net