ThinkGeek offers a very portable, wearable universal charger they call the Bracer of Battery Life +2. Unlike most charge-as-you-go chargers, this battery-extender doesn’t ruin the sleek lines of your phone, mp3 player, or gaming device, and you don’t need a different one for each of your gadgets. You wear the Bracer on your wrist like a bracelet, and you’ll have a 1500 mAh, 5.5V power source at the ready. The Bracer has a rechargeable lithium ion battery that recharges with the included USB cable. There’s a power button, a power status LED, and a 4-LED power level meter. The Bracer comes with a universal power output cable and nine connectors. You’ll receive connectors for iPhone, Nokia I (3.5 mm), Nokia II (2 mm), LG, Samsung i900, Sony Ericsson, Sony PSP, NDS Lite, Nintendo DSi, and a mini USB connector for Motorola/HTC/Dopod/and many mp3/mp4 devices. It’s $34.99 from ThinkGeek.