"Dustbuster" type vacuums, internal unreplaceable batteries that will maybe last two years before they won't hold a charge. Just buy a mini shopvac with an extension cord.
As much as I dislike Dyson (the man), the batteries are nothing to complain about. I have two cordless vacuums from 6 and 10 years respectively, both working fine with their original batteries, and with replacements trivially available and replaceable.
