Lenovo 04W4118 is an RTC/CMOS battery for a laptop, helping retain the system date and time and BIOS settings when the computer is not in use. It comes with a cable for connection inside the laptop.
This replacement part is listed for ThinkPad Edge E430, E431, E535, E445, E530, E530c, E531 and E545 models. Unlike the main laptop battery, it serves the real-time clock and BIOS setting retention functions.
It is intended for service when a compatible laptop does not retain its date, time or BIOS settings, and the RTC/CMOS battery needs replacement.
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