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This review is from: XCSOURCE® Portable Battery Charger Case External Power Bank Pack 2350mAh Back Up Rechargeable Extra Supply For IPhone 4 4G 4S BC001 (white) (Wireless Phone Accessory)
Came fully charged so I could use it straight out of the packet. Used it all weekend and now my phone doesn't run out of power by mid afternoon no matter how many calls I make.