内部エラー。Environment Manager と通信できませんでした

   WARNING:  The battery is experiencing a critical failure:
    - Internal error. Failed to communicate with the Environment Manager
          Without a working battery, the system cannot retain data
          during a power outage, which can result in data loss.
          Power down the system and verify that the battery is
          properly installed.
          To ignore this failure and boot the system in a mode
          where data loss might occur, press 'c' followed by 'Enter'

• BMCシェルで bmc reboot は、はエラーを解決しません