>> Does rercharging =A0make them heavier...
>
> Yes - charging adds about 20 nanograms of
> electrons per milliamp-hour. See below.
>
> E&OE / YMMV.
> Electron mass to charge =3D - *e* / *m**e* =3D -1.758 820 ... E11 C/kg
> 150(44) [image:
> \times 10^{11} {C / kg}].
> 1 Coulomb =3D 1 A.s
> A 2000 mAh cell will gain 2000 mAh =A0/ 1000 =A0mA/A * 3600s/h ~~~=3D 720=
0 Coulomb
> when charged.
> This will mass 7200 / 1.76E11 kg or about 4E-8 kg or about 40 micrograms =
of
> electrons.
> Or, about 20 nanograms per mAh.

I doubt it adds, when the battery is getting charged, those electrons
seem to be drained from "+" and sinked to "-" of the battery.

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