My Harbor Freight windup keychain light has a lithium-ion battery that
sound a lot like that.

http://www.harborfreight.com/mini-dynamo-keychain-flashlight-99859.html

Cheers,

Bob


On Wed, Feb 29, 2012, at 02:50 PM, alan.b.pearce@stfc.ac.uk wrote:
> I have an LED torch that gets its power from being wound up. It has died,
> and now won't charge up by winding, well winding produces voltage, but it
> won't retain charge. Had a look inside it, the generator produces about
> 12V when wound, but the capacitor looking piece immediately drops back to
> about 3V when you stop winding.
>=20
> Does anyone know what is used for energy storage in these? The device in
> it looks like a capacitor, marked=20
>=20
> 3.6V 80mAh
> 12hr 8ma
>=20
> >From the way the voltage across it drops back to almost nothing I'm gues=
sing it has gone AWOL.
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