[btbuildem]

I don't know, it's getting better every day.

The other day, I took apart an old handheld vacuum cleaner to scavenge the internals. All there was inside was a small but powerful motor, and a couple of 18650 batteries with a charge controller and a switch.

Two small batteries, running a relatively powerful vacuum, which could do spot cleans of the whole house (corners and crevices and such) without needing a recharge.

[Toutouxc]

Two 18650s hold about 22Wh of energy, more than two iPhones, and 20x more than what the parent comment is talking about.