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Introduction |
| A dead or defunct CMOS battery can prevent the laptop from properly turning on. The CMOS battery powers the BIOS/UEFI chip in your laptop to keep track of system settings while your laptop is off. CMOS batteries deteriorate naturally overtime due to a limited number of charge cycles. Use this step-by-step replacement guide to remove the dead CMOS battery from your laptop. | | | Swollen batteries are fire hazards and need to be handled with caution. Follow these safety guidelines when removing swollen or corroded batteries from your laptop. [[What to do with a swollen battery|What to do with a swollen battery - iFixit|new_window=true]] | | | Make sure that the laptop is powered off before CMOS battery removal. |
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