RTC Battery

The Lenovo FRU04X0443 RTC battery is an internal service part for a Lenovo laptop, listed under part number 04X0443 and also described as a CMOS battery. It helps keep the real-time clock running and CMOS settings retained while the laptop is switched off or without power.

Unlike the main battery that powers a laptop in normal use, this part supports time and system-setting retention across shutdowns. It is intended for servicing the listed Lenovo models when those functions need attention.

Compatibility includes ThinkPad 11e (5th Gen), ThinkPad Helix, ThinkPad P1 Gen 1 and Gen 2, ThinkPad X1 Carbon 2nd Gen, ThinkPad X1 Extreme, ThinkPad X13 Yoga Gen 1, ThinkPad X390 Yoga, ThinkPad Yoga 11e (Gen 5) and Yoga 13w. The description does not specify the cell format, voltage, capacity, connector or package contents.