drill battery pack charging control

Discussion in 'The Projects Forum' started by peter354, May 8, 2012.

  1. peter354

    Thread Starter New Member

    May 8, 2012
    1
    0
    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
     
  2. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    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.
     
  3. #12

    Expert

    Nov 30, 2010
    16,261
    6,768
    Measure it again now that it has cooled off. Some of these are auto-reset.
     
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