I found a reason to buy into the Makita 10.8v sub-compact line.

Introducing...
The 10.8V Compact Lithium-Ion Cordless Vacuum
Model: CL100DZ
SPECS:
* Up to 12 minutes of continuous use from a single fully charged 10.8V Compact Lithium-Ion battery
* Strong suction power for fast and efficient cleaning
* Redesigned floor nozzle for improved maneuverability and debris collection
* Bagless 2-stage cloth filtration system allows for easier cleaning and quicker debris disposa

If that's not enough, you can upgrade to it's big brother.
18V Compact Lithium-Ion Cordless Vacuum Kit
Model: BCL180W
Specs:
* Up to 10 minutes of continuous use from a single fully charged 18V Compact Lithium-Ion battery
* Strong suction power for fast and efficient cleaning
* Redesigned floor nozzle for improved maneuverability and debris collection
* Bagless 2-stage cloth filtration system allows for easier cleaning and quicker debris disposal
