Samsung ET-CGPK005GSTA AT&T SGH-i777 Battery Charger with Stand - Charger - Retail Packaging - Black Standard 1,650mAh Lithium-Ion Battery. Samsung part no. EB-L1A2GBA / EB-L1A2GBABSTD. External Battery Charger that charges the spare battery. Charger is also a desktop stand for your phone. AC charger that charges either your phone or the External Battery Charger. Compatible with Samsung Galaxy S II (AT&T) i777 / SGH-i777