Well, I have an ICE charger that is easy to operate, does peak charges, batteries are selectable, but requires an external power supply or a car jack that goes into the cigarette lighter.

You can go to Radio Shack and get a battery eliminator 13.6 volt output power supply (emulates a battery in a car) for a relatively inexpensive price which will enable you to connect the charger at home, then you can drag the charger with you to the field and charge just about anything with it.

Great charger.

CGr.