Indeed very interesting thread, I'm somewhat suspicious of the advertised specs of the mp1500, but considering it (or should) provide 1500mAh and the Nokia (pretty much all the Nxx0) are using 1000mAh it makes sense that this would provide 1.5 hence 1h30mn of external power source. For $30, it's pretty good (+ few bucks for the batteries).

Now, nobody said we couldn't put "bigger" batteries in the mp1500, such as these:

http://www.amazon.com/Sony-2500-Rech...9157240&sr=8-1
or better:
http://www.amazon.com/Sony-Battery-C...9157763&sr=8-1

That might get interesting, a whooping 2.5 hours of lifetime for a few bucks, this ain't bad. This obviously assumes that the discharge characteristics of Ni-Mh batteries allow the mp1500 to provide a solid 5v, talking about batteries, is the Nxx0 using a Li-ion or Ni-Mh internally?

Petergunn, would you be able to let us know what sort of battery lifetime you get out of the MP1500 whenever you receive it, under different load patters obviously.

Thanks! (and a happy 2008)