6 of 7 people found the following review helpful
best one I use so far.,
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This review is from: Kinps®2300mAh external power pack case and rechargeable back Up battery charger for iPhone 4 & 4S (Wireless Phone Accessory)
The first post did not arrive so I contacted the seller and without fuss they send me another one right away. I ordered and use several rechargeable in recent months since they are cheap enough to try out. This design is the best of the bunch. With the on and off function is very well design plus is simple to use. Highly recommended.