Macbook air M3 Battery

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  • felix27
    Member
    • May 2023
    • 16
    • Austria
    #1

    Macbook air M3 Battery

    Hi,

    i have a Macbook air M3 15 inch (820-03286) which had some water damage, everything works now but battery charging. Sadly i currently do not have another Battery to test, and want to find out if Battery behaviour is normal before wasting time searching for non existant board problem. Cell voltage is 3.7V for each single Cell but shorting SYS_DETECT_L does not result in any output voltage. Is 3.7V to enable output with SYS_DETECT_L shorted? Macbook shows 65536 Cycles and service recommended so i2c communication seems to be broken. If battery is disconnected it shows normal values for disconnected battery.

    Thanks for your help!
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14691
      • Canada
      #2
      Remove all power. Measure the resistance to ground of the i2c lines used by the battery but on the battery connector. Do not mate the battery. We are testing if the i2c esd diodes are damaged or not on the motherboard.

        Comment

        • felix27
          Member
          • May 2023
          • 16
          • Austria
          #3
          Thank you for the quick answer. They are about 1.6V for scl und 1.4
          v for sda in diode mode, openline in resistance mode

            Comment

            • felix27
              Member
              • May 2023
              • 16
              • Austria
              #4
              I2C lines are also alternating between 2 voltages if charger and battery is plugged in

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 14691
                  • Canada
                  #5
                  They do not look to be shorted. Confirm the proper seating of the bmu flex cable to the motherboard. The i2c lines are communicating over the thin flex cable so be sure the contacts are deep into the molex connector. Piano bar down?

                    Comment

                    • felix27
                      Member
                      • May 2023
                      • 16
                      • Austria
                      #6
                      It is a MacBook Air with the iPhone Like Batteriy Connectior, i definetly connected it properly (also cleaned the contacts)

                        Comment

                        • reformatt
                          Badcaps Legend
                          • Feb 2020
                          • 1528
                          • Australia
                          #7
                          Battery BMU is often damaged from liquid spillage in MAC's. Don't waste your time till you try a known good battery.

                            Comment

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