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which thermistor for battery pack ?

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    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 ?

    #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.
    9 PC LCD Monitor
    6 LCD Flat Screen TV
    30 Desk Top Switching Power Supply
    10 Battery Charger Switching Power Supply for Power Tool
    6 18v Lithium Battery Power Boards for Tool Battery Packs
    1 XBox 360 Switching Power Supply and M Board
    25 Servo Drives 220/460 3 Phase
    6 De-soldering Station Switching Power Supply 1 Power Supply
    1 Dell Mother Board
    15 Computer Power Supply
    1 HP Printer Supply & Control Board * lighting finished it *


    These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

    1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
    2 Hem Saw Computer Stack Board

    All of these had CAPs POOF
    All of the mosfet that are taken out by bad caps

    Comment


      #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


        #4
        Re: which thermistor for battery pack ?

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

        Comment


          #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


            #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


              #7
              Re: which thermistor for battery pack ?

              Nice find for what the problem was
              9 PC LCD Monitor
              6 LCD Flat Screen TV
              30 Desk Top Switching Power Supply
              10 Battery Charger Switching Power Supply for Power Tool
              6 18v Lithium Battery Power Boards for Tool Battery Packs
              1 XBox 360 Switching Power Supply and M Board
              25 Servo Drives 220/460 3 Phase
              6 De-soldering Station Switching Power Supply 1 Power Supply
              1 Dell Mother Board
              15 Computer Power Supply
              1 HP Printer Supply & Control Board * lighting finished it *


              These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

              1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
              2 Hem Saw Computer Stack Board

              All of these had CAPs POOF
              All of the mosfet that are taken out by bad caps

              Comment

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