Tenergy TN323 Dual 2 port USB Car Charger for iPhone, iPad, MP3 and other USB-chargeable devices

I picked one up locally from Tenergy.

On the way to work, I plug it in to try. It lit up light blue and charges my Samsung Galaxy S3 ok.

It was about a 40 min drive and it charged 25% on the phone. Base on that, my guestimate is that

it would take about 2.5 hrs to fully charge the phone.

It's output is 1000mA on one port and 500mA if both ports are used.

For less than $3, I think it is fine. Since I just had it, I can't say much about its longevity.