Duracell’s Mobile Charger not only has a USB port so you can power your iPods and Zunes, but there’s even a slot to put AA/AAA batteries into so you can charge them via wall or car outlet.

The Duracell batteries ... and the battery-change schedule is conservative because of an abundance of caution. It's true that a lithium 9-volt battery will probably last longer than an alkaline ...

If you’re looking for a neat DIY project this weekend, then this DIY 9V Battery USB charger could be a fun gadget to create. With only a few components, including a 9V battery, a female USB port ...