A reliableproduct for extending the battery life of my Iphone4s,
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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 (black) (Wireless Phone Accessory)
I have been using the battery charger case on a regular basis and am happy with its performance. It takes a while to charge but reliably recharges my iphone when I'm out walking and using a power hungry mapping App.