This easy to make box uses no batteries but can still power a lot of stuff. It really is a very versatile little BoostPack based device. It would be the perfect thing to have on hand in times of emergency.
This update goes over my latest research with the BoostPack auto battery replacement project. BoostPacks are now for sale on eBay for $100-$200 Buy It Now. Coupled with a small solar panel my setup has been working flawlessly.