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    Pysense charging current

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    pysenselipolipo batterycharging
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    • J Offline
      jcaron
      last edited by

      Hi all,

      Don't have the tools at hand to check directly, but I was wondering... What is the charging current provided by the Pysense LiPo battery charger?

      The expansion board has a jumper to select 100 mA / 450 mA, but I don't think it's configurable on the Pysense, or is it?

      I usually leave batteries to charge overnight so I never really paid attention, but I need to have a few charged quickly right now and wondering how long it will take ;-(

      J 1 Reply Last reply Reply Quote 0
      • J Offline
        jmarcelino @jcaron
        last edited by

        Hi @jcaron
        The charger on Pysense/Pytrack is not configurable - always set to 450mA

        P 1 Reply Last reply Reply Quote 1
        • P Offline
          PeterB @jmarcelino
          last edited by

          @jmarcelino said in Pysense charging current:

          Hi @jcaron
          The charger on Pysense/Pytrack is not configurable - always set to 450mA

          450 mA is a bit much for a 300 mAh battery specified for max 1 C chargecurrent.
          Which resistor to replace to get it to 300 mA?
          i.e. according BQ 24040 spec relace a 1k2 resistor with a 1k8 resistor?

          M 1 Reply Last reply Reply Quote 0
          • M Offline
            Martinnn @PeterB
            last edited by

            @peterb If you look at the PCB, from pin 2 (ISET) of the charger a trace goes directly to a 0402 resistor (which is connected to GND), measuring 1.2 kOhm. Looks pretty obvious to me. Probably difficult to see without microscope though.

            P 1 Reply Last reply Reply Quote 1
            • P Offline
              PeterB @Martinnn
              last edited by

              @martinnn said in Pysense charging current:

              @peterb If you look at the PCB, from pin 2 (ISET) of the charger a trace goes directly to a 0402 resistor (which is connected to GND), measuring 1.2 kOhm. Looks pretty obvious to me. Probably difficult to see without microscope though.

              Thanks!
              I will find a mircroscope.

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