This isn't for your car but it's something that a lot of you will probably be interested. It's a portable charger that can be used to charge anything that uses a USB and it holds a large charge. this unit, which measures 3"x3"x1" can charge up to 5 I-phones on one charge. It can be used on all phones, I-Pads, GoPros and all kinds of devices.

PRICE- $99.00 Retail
Introductory Price- $89.00
GROUP BUY (10 Units)- $79.99 with shipping to US lower 48



Check out the GoPuck.