On Thu, 06 Mar 2008 06:36:34 GMT, "A. Kay" put
finger to keyboard and composed:

I am looking for a PTC thermistor, epoxy coated with approximately these
characteristics:
6.8k ohm at 45 degrees celsius

I have an old nicad battery pack with a thermistor that failed during
charging and one of the battery cells split along with the thermistor. The
thermistor is inside the battery pack and connected in series with the
charging circuit.

If the device is in series with the battery, then it must be a thermal
and/or current limiting protector of some kind, possibly a polyswitch.
Elsewhere you state that the application is a cordless drill, so I
would expect a charging current of up to 1A or more.

Alternatively, if your battery pack has a third terminal, then your
mystery device could be a temperature sensing thermistor.

- Franc Zabkar
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