Sand battery - video

[BuffaloJohn]

complete and utter BS.

This is not a battery, this is a heat engine (looks like a Stirling engine), nothing more, sitting on a higher temperature source (the sand heated on the stove) and it converts heat into motion.

Worst is the BS in the comments on yt where folks are amazed at this invention and how great it is for the future of mankind.

One step below a perpetual motion machine. Utter and complete nonsense.