Removing and replacing a CMOS battery

The complementary metal-oxide semiconductor (CMOS) battery is a coin-shaped power cell that is mounted inside the node canister. It is used to keep the system time when there is no power to the node canister.

About this task

  • Use this procedure to remove and replace a CMOS battery in a node canister.
  • The node canister must be shutdown and removed to perform this task.
  • A Philips screw driver is needed to remove the canister cover.
  • Recycle or discard the battery as instructed by local regulations.

Procedure

  1. Remove the node canister, as described in Removing and reseating a node canister.
  2. Remove the node canister cover, as described in Removing and replacing the cover of a node canister (IBM SSR task).

Removing the CMOS battery

  1. Locate the CMOS battery inside the node canister.
    Figure 1. Locating a CMOS battery
    Locating the CMOS battery
  2. Use a flat head screwdriver to gently pop the CMOS battery out of the battery holder, as shown in Figure 2. However, do not remove or loosen any screws in the node canister.
    Figure 2. Replacing a CMOS battery
    Replacing a CMOS battery

Replacing the CMOS battery

  1. Orient the replacement coin cell with the positive side up.
  2. Gently push the new coin cell down into the battery holder.
  3. Install the node canister cover, as described in Removing and replacing the cover of a node canister (IBM SSR task).
  4. Reinsert the node canister, as described in Removing and reseating a node canister.
    If the canister does not begin to power-up, check that it is fully inserted into the enclosure.
  5. Reconnect all cables.
  6. Use the management GUI to check that the time and date settings of the system are correct.
    1. If a CMOS battery error is present in the Event Log, run the fix procedure.