The Rome Tech CMOS battery is a must-have upgrade for any Lenovo ThinkPad X240 / X240I / X240S or ThinkPad X250 laptop. This CR1632 3V battery offers reliable power to your computer's critical functionality, including the BIOS, RTC (Real-Time Clock), and other internal components. With its slim design and easy replacement capabilities, you can ensure your laptop remains functional and efficient, even with one or two dead batteries. The integrated 2-wire cable provides a secure connection for data transfer and power distribution, ensuring a seamless installation experience. Invest in your laptop's longevity and performance with the Rome Tech CMOS battery, and trust that it will deliver consistent, uninterrupted functionality for years to come.