Cheap battery pack
 

Anyone tried this battery?

https://www.dealextreme.com/details.dx/sku.3060

Is is enough to fully charge a Nxx?

Re: Cheap battery pack
 

I just purchased a USB carcharger pack with the tips for my phone and N810. Cost was less than the tips were elsewhere. Tested the power output with the thing plugged into a USB desktop port briefly, was less than the standard charger. Left it plugged in overnight, never came to full charge but does read 7 hours remaining,, versus 9 or 10, which I normally get from the wall wart.
I'd suspect this unit is slightly underpowered but would work.