HPE 727258-B21 Backup Battery

The HPE 727258-B21 backup battery is a replacement battery module designed for use with HPE RAID controllers in ProLiant DL, ML and SL server platforms. Supplied as a single unit, it provides temporary power to the controller cache to preserve write cache contents during power loss, helping protect data integrity and maintain storage subsystem behavior.

Advantages

The backup battery offers reliable, manufacturer‑specified backup power for HPE RAID controllers, ensuring cached data is maintained until normal power or a safe shutdown occurs. It is a direct fit for compatible ProLiant servers and follows HP Enterprise specifications for performance and compatibility, reducing the risk of data loss associated with unexpected power interruptions.

Suitable for

• HPE ProLiant DL, ML and SL servers using compatible RAID controllers
• Data centers and small server rooms requiring cache protection
• Maintenance replacement for failed or expiring controller batteries

Key specifications

• Manufacturer: HP Enterprise
• Model / MPN: 727258-B21
• EAN: 4514953616974
• Package: single backup battery unit
• Category: I/O adapters and controllers (RAID controller battery)

How to use

Power down the server or follow the hot‑swap and safety procedures recommended by HPE for your specific ProLiant model. Remove the old battery module from the RAID controller or corresponding battery holder and install the HPE 727258-B21 in the same orientation until it seats firmly. After installation, verify the controller firmware recognises the new battery and check system management tools or server logs to confirm normal operation.

Recommendations

Replace the backup battery according to HPE maintenance intervals or when controller diagnostics report diminished battery health. Store and handle the battery following HPE safety guidelines and dispose of used batteries in accordance with local electronic waste regulations.