727258-B21 is the HPE option part number for 96W Megacell Smart Storage Battery with 145mm Cable. It supplies backup power to HPE Smart Array controllers with flash-backed write cache, allowing cached write data to be preserved when system power is lost. The battery ships with a 145mm (5.7 inch) power cable, which determines how far the battery can be mounted from the controller connection point inside the chassis. Supported platforms include the DL20 Gen9, DL60 Gen9, DL80 Gen9, ML110 Gen9, DL120 Gen9, ML150 Gen9, DL160 Gen9, DL180 Gen9, ML350 Gen9, DL380 Gen9, DL388 Gen9 and DL560 Gen9. Order to this number when configuring or expanding a Gen9 server to a specified build.
HPE Option Part #: 727258-B21
HPE Spare Part #: 750450-001, 815983-001, 878643-001
HPE Model #: 727260-001, 727260-002
PRODUCT SPECIFICATIONS FOR 727258-B21:
- Device Type: Battery
- Connectivity Details Length: 5.7 inch (145mm)
- Connectivity Details Type: Power Cable
- Watts: 96W Megacell
- Battery type: Smart Storage
COMPATIBLE WITH:
PROLIANT DL SERIES
PROLIANT ML SERIES
** This list may not be complete. Contact us via Live Chat if you have any questions about compatibility.
FREQUENTLY ASKED QUESTIONS ABOUT 727258-B21
What is the difference between 727258-B21 and 750450-001?
They are the same physical 96W Megacell Smart Storage Battery. 727258-B21, the number on this page, is the HPE option part number, the orderable configuration identifier used when specifying a server build. 750450-001 is a spare part number, used for service replacement of an installed unit. This family also includes a second spare number and two OEM model numbers, all listed in the cross-reference block on this page. An OEM model number identifies the manufactured unit itself rather than how it is ordered.
Which servers does this battery support?
This 96W Megacell Smart Storage Battery is listed as compatible with the HPE DL20 Gen9, DL60 Gen9, DL80 Gen9, ML110 Gen9, DL120 Gen9, ML150 Gen9, DL160 Gen9, DL180 Gen9, ML350 Gen9, DL380 Gen9, DL388 Gen9 and DL560 Gen9. Confirm the target platform appears in that list before ordering, and confirm the chassis has a defined mounting location for the Smart Storage Battery in your configuration.
Why does the cable length matter?
This unit is supplied with a 145mm (5.7 inch) power cable. The cable length determines the maximum distance between the battery mounting position and the connection point used in the chassis. Smart Storage Battery kits are offered with different cable lengths for different chassis layouts, so verify that 145mm matches the routing path documented for your server model before installing.
What does the Smart Storage Battery actually do?
The Smart Storage Battery is a centralized backup power source for HPE Smart Array controllers using flash-backed write cache. When system power is interrupted, the battery provides the energy needed to move cached write data to non-volatile flash on the controller, so pending writes are not lost. This is what allows write caching to be enabled safely on the supported Gen9 platforms listed above.
HPE PARTSURFER INFO FOR 727258-B21
| Spare PN | Description | |
|---|---|---|
 | 750450-001 | 96W Smart Storage Battery - For DL/ML/SL Generation 9 series of servers - One battery pack provides flash back write cache (FBWC) for all the drive controllers in the server - Connects to the system I/O board, 145mm (5.7-inch) long cable |
| 815983-001 | 96W Smart Storage Battery - For DL/ML/SL Generation 9 series of servers - One battery pack provides flash back write cache (FBWC) for all the drive controllers in the server - Connects to the system I/O board, 145mm (5.7-inch) long cable |
Last Updated: 2026-09-09
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This product is warrantied against hardware failure for a period of 30 Days from the date of purchase. Before making a purchase, please take a moment to review our return policy below.
Returns
It is the customer's responsibility to verify compatibility with their machine(s) before placing an order. If an item is ordered by mistake, it can be returned for refund, minus a 25% restocking fee, within 5 business days of receipt. The cost of freight is not refundable.
Please be aware that factory-sealed equipment can only be returned if it remains unopened.
Defective Products
If you have received a defective part and your machine is still within the HPE warranty period, please initiate a warranty exchange by visiting the HPE Enterprise Support Center. Be sure to have the serial numbers of the defective drive and your server/storage array handy.
In case your hardware becomes defective during the Global One warranty period, but the HPE warranty has expired, you can return the product to us for a working replacement. You are responsible for the shipment of returned merchandise. However, we will cover the expense of Ground /Economy shipment for the replacement item(s).
Requesting an RMA
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