E&OE

> ...ultracap energy density...is about 1/10 of a decent battery.

Or less.
At 10 AH capacity as C Nimh has about V x Ah x 3600 J  =3D 1.1 x  10  x
3600 ~=3D 40,000 J energy capacity

Capacitor energy =3D 1/2 x C x V^2 so C =3D 2 x E / V^2
At 2.5V say that Farads =3D 2 x 40,000 J / 2.5^2 =3D 12,800 Farad

This is Digikeys highest capacitance priced supercap - 2.7V at 4000F.
$220 each in hundreds and a bit bigger than a C cell
800 mm tall x 53.5 mm dia.
That's a "548000"  :-)

A way to go yet.
Hmmm 3 milliohm "DC resistance"
Yee Ha.

Note that leakage on these large caps is usually horrific.

 Russell McMahon


>
> Quite true. I'm sufficiently inefficient at soldering that I doubt
> it'd matter, =A0providing the iron's cradle also charged it.
>
> Maybe the DX model one of Russel's near-field chargers.... =A0;)
>
> =A0Jack
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.