Designed as a device-agnostic but iPod-compatible portable battery pack, Kensington's new Portable Power Pack for Mobile Devices ($60) includes a wall power adapter, a USB cable, and a rechargeable black battery. The battery has blue lights that indicate its current power level, plus a button to activate the lights briefly, as well as input and output USB ports. You need to supply the iPod-to-USB cable, which Kensington promises will enable up to…
