This discussion reminded me of a model aircraft when I was young which
claimed the most amazing development in propulsion and battery technology
which could keep the plane airborne for 20 minutes, just add water.
So it basically had what looked like two Tea bag sized batteries with wires
at the top corners. the plane was made of flimsy polystyrene foam and the
motored seemed to be some kind of brushless design with a big slow propeller
on the front. You put your water in shook them and then launched it, Note
you needed to do this on a totally still day or it would just blow away. It
would mostly beetle about for maybe five minutes using the batteries then
the propeller stopped and it glided to the ground.

Each time you used the batteries it went for less time.

Still it was the 1960s, and I guess the thought was there....
Brian

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"jon" wrote in message ...
On Tue, 11 May 2021 15:13:23 +0100, Commander Kinsey wrote:

https://www.ebay.co.uk/itm/353441460780

1200W cordless vacuum cleaner? Running off what looks like 2 18650 Li
Ion batteries. So since those are about 4V each, that's 150 amps from
one battery. I'm not so sure that's going to work....

That is probably the instantaneous power, lasting 5 secs. My little power
pack will start a car engine.