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 s

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.