I have a Black & Decker drill/driver with a 20v Lithium battery much like the one linked below. Believe it or not, I found it on the sidewalk in front of a friend's house one Saturday morning a couple of years ago. Must have fallen off of someone's vehicle. As others have mentioned, the battery life is amazing. And more importantly since I don't use it all that often, has a low self-discharge so that it's ready to go when I pick it up after a few weeks, or even months, of non-use.
That said, I really don't use it that much on vacuum cleaners except maybe to break loose a stubborn screw or bolt, although some Liquid Wrench and a screwdriver bit on a ratchet seems to work equally as well. I just prefer to be able to feel what I'm doing, which you can't do with a power tool.
[URL unfurl="true"]https://www.ebay.com/itm/Used-Black-Decker-BDCDE120C-20V-MAX-Lithium-Drill-Autosense/153346743636?epid=668657873&hash=item23b42d9d54:g:E5UAAOSw5wNcRMIc:sc:USPSPriority!27455!US!-1:rk:31
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