Removing and replacing a CMOS battery

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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. Dispose of the faulty battery properly.

Procedure

  1. Remove the node canister, as described in Reseating a node canister in the control enclosure.

Removing the CMOS battery

  1. Remove the node canister cover, as described in Removing and replacing the cover of a node canister.
  2. Locate the CMOS battery inside the node canister.
  3. Use a flat head screwdriver to gently pop the CMOS battery out of the battery holder, as shown in Figure 1. However, do not remove or loosen any screws in the node canister.
    Figure 1. 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. Replace the node canister cover, as described in Removing and replacing the cover of a node canister.
  4. Reinsert the node canister, as described in Reseating a node canister in the control enclosure.
    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.