Has anyone used anything like this? http://www.amazon.com/HYPE-Universal-External-Netbook-Notebook/dp/B008G2ZX42
(This is a cheap knock-off version of this: http://www.amazon.com/Lenmar-PowerPort-Laptop-Portable-Computers/dp/B003JTHOEO)
They are essentially some LiPos that charge off any...