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This review is from: RAVPower PB07 10400 mAh White External Battery Pack Portable Charger Power Bank (Dual USB Outputs, Ultra Compact Design), for iPhone, iPad, Mini; Samsung Galaxy, Note 3; HTC One, EVO; Google Nexus
Cons: very inconsistent, rarely works
Other Thoughts: I own a Samsung Galaxy S3. The RAVPower would fully charge up overnight. When I plugged it into my phone, it would not work at all. I bought 3, so I gave the others to friends. They didn't seem to have much of a problem. When I tried it with mine, it would not work. The specs said that the S3 was compatible, which is disappointing because I was hoping that it would be very useful for my travels.
I did try it once again after, and it worked. I thought it a miracle! But since then, it has not been able to keep a charge for me. Quite disappointed with my investment.