hi
dont know is anybody can help

replacing the batteris in my drill pack and found that it has what looks like a thermistior??? to control chaging temp(third connection). unfortunatly when dismantling I shorted it out to + and i believe blew it. i need to renew it as it looks like it feeds relay in charger to switch when fully charged (its a 1 hour fast charge) however dont know what it is . it appear to be connected in series with a resistor ???(again not sure can up load a photo if it helps)
the thermistor is 2 wire and marked M20 tp118/c 02c if that helps, the resistor 05u-045G
peter

 

A picture would help. Says more than 1000 words. All battery packs must contain some sort of fuse. So I will guess your mystery part is a polyfuse. http://en.wikipedia.org/wiki/Resettable_fuse Can not be sure then. As the battery pack may also contain a thermal switch normally closed. Without proper safety. Your battery pack may be converted to a delayed-action bomb.

 

Measure it again now that it has cooled off. Some of these are auto-reset.