7 ms·
Similar idea but from 3 years ago: http://www.geekalerts.com/wind-up-battery/ http://www.geekalerts.com/wind-up-battery/ That one appears to harness the mechan
by gordian 15y ago
Similar idea but from 3 years ago: http://www.geekalerts.com/wind-up-battery/ http://www.geekalerts.com/wind-up-battery/
That one appears to harness the mechanical energy directly.