I read in sci.electronics.design that Paul Burke wrote
(in ) about 'PC CPU fan', on Tue, 4 Oct
2005:
René wrote:

And now I will go on with my design of a battery charger that cuts off
the charging process based on weight increase of a charged pack.

Take a 12V, 100AH battery. That's 12*100*3600J = 4.32MJ. e=mc^2, so the
mass gain from flat to full is e/c^2 = 5e-11N, or about 5e-12Kg. Piece
of ****, but works better with bigger batteries.

5 nanograms? I'm sure Win could measure that in a force 8 gale.
--
Regards, John Woodgate, OOO - Own Opinions Only.
If everything has been designed, a god designed evolution by natural selection.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk