This li’l bitty device is definitely something I’d stuff in my gadget bag. The iGo powerXtender holds 4 AA batteries and uses iGo’s interchangable power tips to help juice up your mobile devices or provide up to 8 watts of continuous power. You wouldn’t use this to completely charge a device; it’s really geared towards adding a few precious hours of energy for your phone, PDA or other small device. At a suggested price of $24.99, I’d consider it lightweight and cheap insurance! Here’s one “tip” if you’re interested in the powerXtender: the interchangable tips are not included.