External Laptop Batteries

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 generic laptop charger. They can output 5v, 16v, or 19v and they have a capacity of 5500mA.

I've been considering using them for a gamecube portable because the regulator can take upwards of 20v (thanks zenloc!)

Basically I was wondering has anyone torn apart anything like this or used something similar? $33.99 shipped is a pretty appealing price tag!
 
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