For about $35 you can take your nerd cred to the next level by getting a Bracer of Battery Life +2 which is basically a wristband with batteries.
"The Wrist Charger, or as we like to call it, Bracer of Battery Life +2, straps comfortably to your wrist and plugs in to just about any electronic device you like. It’ll power cell phones, mp3 players, gaming systems, or any device compatible with mini USB. Now you’ll have plenty of power to get through long days traveling (or long lines at the DMV, we’ve been there, too!). When you reach your destination, simply plug your bracer in and charge its battery back up so you’re ready with plenty of entertainment for the long trip home."
- Rechargeable Lithium ion Battery (1,500mAh, 5.5V)
- Capacity: 1,500mAh, 5.5V
- Input: DC 5V
- LED Indicators – Power-On and 4 Levels Power Meter
- On/Off button design
- Dimension: 256 x 34 x 12mm (approx.)
- Weight: 82g
- iPhone
- Nokia II (2mm)
- Nokia I (3.5mm)
- Mini USB (for Motorola/HTC/Dopod/MP3/MP4)
- LG
- Samsung i900
- Sony Ericsson
- Sony PSP
- NDS Lite
- Nintendo DSi
- 1 x USB Wrist Band Battery
- 1 x Mini USB Cable
- 1 x Charger Output Cable
- 9 x Connectors
[Via]
I like the skinny pale arm model