battery on cordless power nozzles
I'm not sure if the battery on the volt is designed to be user replaceable or not, but the battery on the Perfect power nozzle, which is very similar to an Aerus Electrolux power nozzle definitely is, it can be easily removed and a new battery can be attached, and the charger connects to the battery itself, not the nozzle for charging. It would be really interesting to have a cleaning comparison between these two battery nozzles, of course, some of this would depend on the vacuum it was used on but it would be interesting.
I have not seen replacement batteries available yet for the Perfect nozzle, probably because it's still pretty new. They will both give excellent carpet cleaning ability to a straight suction vac.
I recently read that Wessel-Werk was getting in to the battery nozzle market as well, that should be interesting if it's true.
Mike