mm wrote in
:

On Tue, 19 Jun 2007 06:49:37 -0700, KC wrote:

On Jun 18, 3:30 pm, Jim Yanik wrote:

there's a thermoswitch inside the battery pack,the third terminal is
the sense terminal.It opens when the temp goes higher than the
switch rating.


I saw that in there but just assumed it was a charging current
limiting resistor. Learn something new every day! Thanks.

Just about every rechargeable battery pakc, even the seemingly simple
ones, going back for more than a decade has a three pin connector.
Are thyey always a thermoswitch, or what other uses might they have?

KC




possibly a thermistor;a temp sensitive resistor,it can be either positive
coefficient or negative.

pos thermistor increases resistance(R) with increase in temp,neg decreases
R with increase.

I'd guess that thermistor sensing is rare.It requires a more complex
circuit.

--
Jim Yanik
jyanik
at
kua.net