Replacing the NVMEM battery

To replace the NVMEM battery in your system, you must remove the failed NVMEM battery from the system and replace it with a new NVMEM battery.


  1. If you are not already grounded, properly ground yourself.
  2. Check the NVMEM LED:
    • If your system is in an HA configuration, go to the next step.
    • If your system is in a stand-alone configuration, cleanly shut down the controller module, and then check the NVRAM LED identified by the NV icon.

      Attention: The NVRAM LED blinks while destaging contents to the flash memory when you halt the system. After the destage is complete, the LED turns off.
      • If power is lost without a clean shutdown, the NVMEM LED flashes until the destage is complete, and then the LED turns off.
      • If the LED is on and power is on, unwritten data is stored on NVMEM.

        This typically occurs during an uncontrolled shutdown after ONTAP has successfully booted.

  3. Open the CPU air duct and locate the NVMEM battery.

    Battery lock tab
    NVMEM battery pack
  4. Grasp the battery and press the blue locking tab marked PUSH, and then lift the battery out of the holder and controller module.
  5. Remove the replacement battery from its package.
  6. Align the tab or tabs on the battery holder with the notches in the controller module side, and then gently push down on the battery housing until the battery housing clicks into place.
  7. Close the CPU air duct.
    Make sure that the plug locks down to the socket.