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81Y4491 ✓ Verified by PartsTable
IBM · CONTROLLER · RAID_HBA
WHAT YOU NEED TO KNOW
RAID HBAs — always confirm bracket height (full or half). Ship unlocked with test reports. Our edge: we can verify specific firmware versions. Key checks: Ship with test reports. Ship UNLOCKED.
Firmware must match server
PRODUCT OVERVIEW
IBM SERVERAID M5100 BATTERY KIT

IBM SERVERAID M5100 BATTERY KIT. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
CONTROLLER→ RAID_HBA→ 81Y4491
SPECIFICATIONS
Part Number81Y4491
ManufacturerIBM
COMPONENT DIAGRAM
RAID ASIC CACHE FBWC SAS 0 SAS 1 SAS 2 SAS 3 BATT EXT 0 EXT 1 PCIe x8 ~187 mm STORAGE CONTROLLER | RAID 0,1,5,6,10 | PCIe SAS/SATA | FBWC cache | Battery backup connector | TITLE RAID CTRL PN 81Y4491 MFR IBM IBM Serveraid M5100 Battery Kit
TYPICAL APPLICATIONS
  • RAID cache protection during power loss events
  • Write-back cache enablement for storage controllers
  • Enterprise server data integrity assurance
  • Hot-swap battery/capacitor replacement in production
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
81Y4508Compatible
IBM ServeRAID M5100 Series Battery Kit for System x - Option
compatible
00Y3656Compatible
IBM ServeRAID M5100 Series Battery Kit for System x - Option
compatible
81Y4588Compatible
IBM ServeRAID M5100 Series Battery Kit for System x - SBB
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 3
00Y3656SUBSTITUTE
IBM ServeRAID M5100 Series Battery Kit for System x - FRU
IBM
81Y4508SUBSTITUTE
IBM ServeRAID M5100 Series Battery Kit for System x - FRU
IBM
81Y4588SUBSTITUTE
IBM ServeRAID M5100 Series Battery Kit for System x - FRU
IBM
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FREQUENTLY ASKED QUESTIONS
What is 81Y4491?
81Y4491 is a IBM Serveraid M5100 Battery Kit manufactured by IBM. It is classified as a CONTROLLER (RAID_HBA).
What parts can replace 81Y4491?
There are 3 known substitutes for 81Y4491: 81Y4508, 00Y3656, 81Y4588. Substitute compatibility should be verified for your specific system.
Is 81Y4491 still available?
81Y4491 is currently Unknown.
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Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
Last verified: July 2026