Could someone explain weird charging behaviour?

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  • mikay786
    Badcaps Veteran
    • Aug 2014
    • 765
    • UK

    #1

    Could someone explain weird charging behaviour?

    So basically, i have a HP 11" stream laptop where the battery would not charge.

    I assume battery dead, been left off too long so dead. Order a new battery (used but apparently working fine) and again it will not charge.

    I'm starting to think perhaps its a BQ chip of some sort responsible for charging that isn't functioning.


    I have another HP laptop its a bigger 14" model, different battery but uses the same connector. Checked the pinout of both batteries and they line up.

    So hey might aswell try, both the original battery and new replacement both charge on the 14" laptop. I let them charge for 30mins or so each.

    Put the batteries back into the 11" laptop and whoa now they both charge like normal.

    Why is this?, trying to get my head around it for future trouble shooting.

    Why would both batteries not charge from dead no voltage in the 11" but charged fine in the 14" and why are both now charging in the 11" once they had a bit of charge in them.

    Anyway i could avoid this issue in future?
  • mon2
    Badcaps Legend
    • Dec 2019
    • 13837
    • Canada

    #2
    Re: Could someone explain weird charging behaviour?

    It is possible that the laptop that worked to charge the packs are able to deliver more current to initiate the charge cycle.

    After the packs are partially charged, the current draw becomes less and then the original laptop can continue to charge the same packs.

    Reference:
    https://youtu.be/4VDtMUxIvow

    Comment

    • guruji
      Senior Member
      • Oct 2012
      • 118
      • India

      #3
      Re: Could someone explain weird charging behaviour?

      Check the resistors current sensing usually 2ohms to 10ohms and check the trace to the sensing lines ACP ACN and SRP SRN also check your Mosfet drivers the gate use an oscilloscope to see you own . Should solve your issue
      Ohh yes check the embedded controller scl and sdata going to battery connector check output 3.3v the pull-up resistor can check on oscilloscope your clk and smbus data

      Comment

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