CMOS Battery on the Intel® NUC

Last Reviewed: 09-May-2017
Article ID: 000006787

A coin-cell battery (CR2032) powers the real-time clock and CMOS (complementary metal-oxide-semiconductor) memory. The battery has an estimated life of three years when your Intel® NUC isn't plugged into an AC power source. When the computer is plugged in, the standby current from the power supply extends the life of the battery. The clock is accurate to ±13 minutes/year.

The CMOS battery is connected to an onboard header on the processor side of the board by a 1x2 connector. The location of the battery varies depending on the Intel NUC model.

If the battery and standby current both fail: 

  • Date and time values in BIOS might not be accurate.
  • A message displays during POST.
Note CR2032 batteries with a wire and Molex connector might not be locally available. Search the Internet for "CR2032 with wire" or "CR2032 with connector" to find an online retailer.

Follow these steps to replace the CMOS battery:

  1. Disconnect the power cord from the AC power source (electrical outlet or power adapter).
  2. Disconnect all peripheral devices attached to the Intel NUC.
  3. Remove the bottom chassis cover.
  4. Remove the board from the chassis to access the battery on the processor side of the board.
  5. Unplug the battery wires from the onboard connector and remove the battery.
  6. To install the new battery:
    1. Remove the paper backing from the battery adhesive pad.
    2. Insert the battery onto the board next to the thermal solution. Shown in the image above. 
    3. Connect the wires to the battery connector.
  7. Reinstall the board in the chassis.
  8. Replace the chassis cover.
Electrostatic discharge (ESD) can damage components. Apply the procedures described here only at an ESD workstation using an anti-static wrist strap and a conductive foam pad. If a station isn't available, create some ESD protection by wearing an anti-static wrist strap that you attach to a metal part of the chassis.