6th Generation Lenovo ThinkPad X1 Carbon CMOS BIOS RTC Real Time Clock Battery Replacement Repair, by It's Binh (Been) Repaired & Everything Reviewed on YouTube. 17 min 33 s.
- Video length
- 17 min 33 s
- Time to do it
- 30 minutes
- Difficulty
- Medium
- Steps
- 8
What you need
Steps
Power off the laptop and unplug the charger. Hold the power button for a few seconds to drain leftover charge, then put on an anti-static strap or touch a grounded metal surface.
Flip the laptop over and remove the screws holding the bottom cover. Keep them in a cup or tray so none go missing.
Slide a plastic pry tool into the seam along the bottom cover and work around the edges until the clips pop free. Lift the cover off.
Locate the small coin cell wrapped in black tape or held in a plastic sleeve. It is separate from the main battery and usually sits near the edge of the board.
Unplug the CMOS battery connector from the motherboard, or lift the retaining clip if it is a cradled cell. Do not pull on the wires.
Fit the new coin cell with the plus side facing the same way as the old one. Reconnect the plug or snap the clip back down.
Press the bottom cover back on until all clips click, then refit and tighten the screws in a cross pattern.
Power on and press F1 when the 0271 error appears. In BIOS setup, set the correct date and time, save with F10 and exit.
Tips and common mistakes
Check the old cell's model number before buying a replacement, since the X1 Carbon uses a wired coin cell rather than a loose battery.
Work on a clean, well-lit table and keep track of screw lengths, as the bottom cover uses more than one size.
If the 0271 error returns after a few weeks, the new cell may be seated backwards or the connector is loose.
Questions
Will replacing the CMOS battery wipe my files?
No. The CMOS cell only keeps the clock and BIOS settings alive. Your drive and data are untouched.
What does the 0271 error mean?
It means the real time clock lost power, so the date and time settings reset. A fresh CMOS battery usually clears it.
Do I need to open BIOS after the swap?
Yes. Press F1 at the error screen, set the date and time, then save and exit so the error stops appearing.
This guide was drafted from the video's details and general task knowledge. It has not been checked against the full video. Check the video and relevant product instructions before following a procedure. Report a correction.
