Watch batteries last pretty long too.
These pulse motors are neat as a show piece but far from solving any world energy problems.
![Tongue :P](https://www.eevblog.com/forum/Smileys/default/xtongue.gif.pagespeed.ic.J5mTe0A2NA.png)
I'll be impressed if someone manages to power a 100w load for a few months with a simple quick hand crank to get it going. Not going to happen.
Now if you hooked up a couple batterisers to it...