--- Marcel Duchamp <marcel.duchamp@sbcglobal.net>
wrote:

> Bob Blick wrote:
> > Inside my Dell laptop battery there's an unmarked
> > component, a white ceramic sandwich about 4 or 5
> mm
> > square with three very long, flat leads coming out
> of
> > it. Printed on the PC board is "IP1".
> > 
> > I'd normally think it was a current shunt of some
> > kind, but there already is a 0.02 ohm resistor on
> the
> > board.
> > 
> > Just curious, I'm not trying to reverse engineer
> this
> > thing or repair the battery.
> > 
> > Any ideas what it may be?
> > 
> > Cheerful regards,
> > 
> > Bob
> > 
> Most lithium packs (I assume you have LiON pack?) I
> have seen have an 
> over-temperature sensor in them.  Some are
> re-settable; some are one 
> shot devices.  One pack I know of had both a
> one-time thermal fuse and 
> an over-temp one-time device also.

You're right! I pulled it out and it's marked
133(deg)C on the bottom. No idea why it's got three
terminals.

I'm not sure how long I'd sit with a 133C battery on
my lap.

Cheerful regards,

Bob

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