Amazon has the ReVIVE Series Rapid GoCharge External Battery Pack for just $19.99, originally priced at $51.99. This gadget charges the “iPod, iPhone, Android phones, BlackBerry phones, MP3 Players, GPS Units, and other devices that can be charged via USB.” Product page.

Includes 2 charging cables: micro USB and mini USB. Includes a handy Built-in LED Flashlight that will shine for up to 40 hours on a single charge.

[via Amazon]