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Amazon.com: Rome Tech CMOS Battery for Lenovo ThinkPad X1 Carbon 3rd Gen/Lenovo ThinkPad X1 Carbon 4th Gen (Type 20FB, 20FC) - BIOS RTC 3V CR2016 X1 CMOS Battery with 2 Pin 2
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3rd Generation Lenovo ThinkPad X1 Carbon Disassembly SSD Hard Drive Upgrade Motherboard Replacement - YouTube
How to replace CMOS battery on my ThinkPad X1 2nd gen? - Lenovo ThinkPad X1 Carbon (2nd Gen) - iFixit
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