2 of 3 people found the following review helpful
compact fast-charge solution,
Verified Purchase(What is this?)
This review is from: PortaPow Fast Charger for Apple iPhone, Blackberry, Galaxy Note, Xperia, HTC One, Google Nexus (Accessory)
I was a little apprehensive, but thought I'd give it a try. I also have a USB multimeter thing that lets me monitor the current and voltage throughput/draw on a USB connection, so I tested charging my phone (Samsung Galaxy S3), with and without this gadget. I tried both a USB port on a laptop (Dell Latitude), and a powered USB2 hub. In both cases, the dongle fooled the phone and allowed it to charge at a higher rate.
Interestingly, certain situations would cause the draw to drop down, and I had to reconnect to get back to the higher rate of charge.
Overall, I'd say "It does what it says on the tin"