Getac W130 CMOS Replacement Battery 3V 200mAh Lithium

Getac W130 — 3V Lithium CMOS Backup Battery

This is a 3V 200mAh lithium coin cell that replaces the CMOS backup battery in the Getac W130 rugged laptop. It sits on the motherboard and powers the RTC circuit and SRAM when the main battery is removed or the unit is off. Without it, the W130 loses its clock, BIOS settings, and stored configuration on every power cycle.

• W130 motherboard fit: The W130 uses a soldered or socketed coin cell to maintain the RTC circuit and CMOS SRAM. When the cell drops below 2.8V retention voltage, the chip loses power between cycles and resets to factory defaults — date, boot order, and any custom BIOS flags included.
• Bench tested on actual hardware: We measured open-circuit voltage on each cell before dispatch. Storage voltage reads between 2.95V and 3.05V. Once installed, the RTC circuit draws microamps and the cell settles at its rated 3.0V operating voltage.
• Post-install clock correction: After fitting the new cell, enter BIOS immediately and set the correct date and time, then save and exit. The RTC circuit resets to a default date during the swap — any time the CMOS cell loses power, the clock reverts and must be corrected manually before the OS boots.

BIOS clock resetting to 2000 after every power cycle on the W130

The W130 RTC circuit pulls power exclusively from the CMOS coin cell when the main battery is absent or the unit is shut down. Once the cell drops below 2.8V, the SRAM backing the clock loses retention and the RTC resets to its default epoch — typically January 1, 2000. This happens even if the main battery is otherwise healthy, because the two power rails are separate. Replacing the coin cell and correcting the date in BIOS resolves the reset loop immediately.

CMOS checksum error on boot after the coin cell is replaced

A checksum error on boot means the BIOS compared stored settings to its checksum and found a mismatch — this happens when the CMOS SRAM lost power during the cell swap and all values reverted to defaults. The error is not a sign of a faulty new cell. Enter BIOS setup, restore any custom settings, set the correct date and time, then save and exit. The checksum recalculates on the next boot and the error clears.