This high-quality replacement CMOS battery is specifically designed for a wide range of Lenovo ThinkPad laptops, including models such as the ThinkPad X390, X13, T14s, L15, and L14 — covering both Gen 1 and Gen 2 variants. It serves as a direct OEM-equivalent replacement for the original motherboard (RTC/CMOS) battery, ensuring stable power supply to the real-time clock and BIOS settings even when the main battery is removed or the laptop is powered off. Compatible with standard CR2032-based socket configurations used across these ThinkPad generations, this battery helps prevent BIOS time resets, configuration loss, boot errors, and authentication failures caused by low voltage. Built with reliable lithium manganese dioxide chemistry, it delivers consistent 3V output, extended shelf life, and enhanced safety features including over-discharge protection and leak resistance. Easy to install — no soldering required — simply replace the old cell in the designated battery holder on the motherboard. Ideal for IT professionals, repair technicians, and end users performing routine maintenance or restoring legacy systems. Each unit undergoes rigorous quality control and comes individually packaged with handling instructions. Note: Always power down and disconnect all power sources before replacing. Not compatible with non-ThinkPad devices or models outside the specified list. For optimal performance, replace every 3–5 years or when BIOS time drift exceeds 1–2 minutes per day. A must-have spare part for maintaining system integrity, data security, and seamless operation across your ThinkPad fleet.