which thermistor for battery pack ?

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  • petehall347
    Badcaps Legend
    • Jan 2015
    • 4429
    • United Kingdom
    #1

    which thermistor for battery pack ?

    ok got a 80v lithium pack in with dodgy temp sensing thermistor .its stuck at 13.5k .
    have removed it and tacked a 10k resistor across where it goes and now the charger thinks its good to charge proving it is the thermistor ..
    question is would a MF52D 3950 1% High Precision NTC Leaded Thermistor work ok for this application ?
    Tags: None
    • sam_sam_sam
      Badcaps Legend
      • Jul 2011
      • 6057
      • USA
      #2
      Re: which thermistor for battery pack ?

      This might be a better choice

      P/N 1600-10K Thermistor

      I could not find the temperature chart for this particular part number

      MF52D 3950

      You might want to find out what the temperature range that this charging unit has

      Use a pot and find out what the range is
      Last edited by sam_sam_sam; 04-19-2021, 03:34 PM.

        Comment

        • petehall347
          Badcaps Legend
          • Jan 2015
          • 4429
          • United Kingdom
          #3
          Re: which thermistor for battery pack ?

          good idea if i can find a pot . i can get hold of another battery pack and check extremes of the one fitted by blowing hot air and freezing it .

            Comment

            • petehall347
              Badcaps Legend
              • Jan 2015
              • 4429
              • United Kingdom
              #4
              Re: which thermistor for battery pack ?

              i think 3950 is the beta ....MF52D is the part number

                Comment

                • petehall347
                  Badcaps Legend
                  • Jan 2015
                  • 4429
                  • United Kingdom
                  #5
                  Re: which thermistor for battery pack ?

                  rooting around the net it looks like beta 3950 are used in some packs so will order a couple of them and see how it behaves .

                    Comment

                    • petehall347
                      Badcaps Legend
                      • Jan 2015
                      • 4429
                      • United Kingdom
                      #6
                      Re: which thermistor for battery pack ?

                      ok i fitted the new thermistor but it was still playing up . i had spliced the new wires to the old and didnt notice the wires had been trapped since it was built in the factory . fixed that problem and now all is well .

                        Comment

                        • sam_sam_sam
                          Badcaps Legend
                          • Jul 2011
                          • 6057
                          • USA
                          #7
                          Re: which thermistor for battery pack ?

                          Nice find for what the problem was

                            Comment

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