The GO! series chargers are amazing. Charge your battery from AC, test your battery with the built-in tester, charge your USB device, or best or all charge those units using the GO! unit's built-in battery. Yes, you can charge your battery even when there's no power outlets available!

GO! 5 fits:
NP-60/90 for Casio
NP-BN1, NP-BK1 for Sony
KLIC-7003 for Kodak
DMW-BCF10, DMW-BCG10 for Panasonic
Li-50B for Olympus
D-Li88, Li92 for Pentax
NB-6L for Canon
EN-EL12 for Nikon