Is there a cordless hand vac that will charge using DC?

I understand the desire for cordless, who can't, but screw that,

I'm getting one of these, just add 5 or 3 gallon bucket:


http://www.homedepot.com/p/Bucket-Head-5-gal-Wet-Dry-Vacuum-BH0100/202017218

4 amps at 115Vac AC. Hello inverter.

Lowes sells a bucket top version for the same price but it is SHop Vac branded and consumes 6.5 amps.