Cordless vacuum cleaner

Can you get them? I don't mean dirt devil type things or ones for building sites, We need a 2000kw ordinary vacuum cleaner but cordless would be ideal, maybe like rechargable????

nilfisk do one, its like a back pack.

you also look into the ones that are built into your walls, there is a company called Beam who do the,

[broken link removed] do a couple of wet/dry vacs, but at around €250 or so with battery and charger, might be a little rich if you don't already have the battery & charger. Dyson have been advertising one recently, looks to be about €150+ online.
Leo