2 of 3 people found the following review helpful
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This review is from: Kinps for Apple Iphone 5 5S 4200mAh External Rechargeable Spare Backup Extended Battery Charger Pack Case Cover for Iphone 5/5S -Black (Wireless Phone Accessory)
Really good, gives at least double the power.
Pack is a bit on the bulky side but def worth having if you're taking photo's / using apps!