It seems like you know a thing or two about li-ion chargers. How hard would it be to modify one of the batteryspace chargers to output at 3A, or modify your diagram. I'd like to learn how those chargers work. Couldn't you use that top charger on a portable that has Daft Mikes Low battery indicator modified (and integrated) to make it so it doesn't discharge to the extent that it needs a "tickle" charge?