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I need to execute the SuperCluster Preventive Maintenance for RAID HBA Batteries on Exadata Storage.
Then I need to know to poweroff a cell to replace the Batteries.
Thanks in advance
Take a look at the documentation. There's a chapter called "Shut Down or Reboot a Storage Server" (https://docs.oracle.com/cd/E58626_01/html/E58635/z4001567132421442.html#scrolltoc )
You may refer below MOS note:
Steps to shut down or reboot an Exadata storage cell without affecting ASM (Doc ID 1188080.1)