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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.
Follow these safety guidelines when removing swollen or corroded batteries from your laptop (insert link)
Make sure that the laptop is powered off before CMOS battery removal