Would the MP15x0 power the device, or charge the battery which itself power the device? I'm under the impression that devices that provide power over USB do not charge the battery, subsequently if the battery is dead, this solution would not allow to hot-swap batteries without shutting down the nokia itself. This may not be a big deal for most, but I wanted to clarify for others. Please correct me if I'm wrong...

Nevertheless, for that price range, this is pretty good indeed.