Macbook and BIOS battery

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  • Adenitz
    Senior Member
    • Jan 2021
    • 122
    • Congo
    #1

    Macbook and BIOS battery

    Hello guys,

    it seems that no Macbook uses BIOS battery that is almost always present in PC laptops. I guess that Macbook battery is also used for that purpose.

    I wonder why BIOS battery is needed in most PC laptops and why Macbook is different.

    Thank you!
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: Macbook and BIOS battery

      Laptops with non-removable batteries don't use a coin cell battery, RTC circuit is powered from main battery pack. Laptops with removable batteries do use a coin cell battery, RTC circuit is powered from coin cell battery when main battery pack is removed.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • Adenitz
          Senior Member
          • Jan 2021
          • 122
          • Congo
          #3
          Re: Macbook and BIOS battery

          Hello piernov, thank you for your reply. However I'm not sure this is the reason. Today I have upgraded HDD to SSD on HP x360 m3 2in1 and I noticed Bios battery even if battery is closed inside the case.
          Please have a look at this: https://youtu.be/jjFFoWidcm8

            Comment

            • RethoricalCheese
              Badcaps Legend
              • Mar 2013
              • 1517
              • Estonia
              #4
              Re: Macbook and BIOS battery

              HP just tends to use separate batteries. Otherwise piernov is correct.

              There's no difference between PC and Mac when talking about bios batteries. Some use, some don't and that's how it is. When a laptop has user removable battery, it has a bios battery.

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