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782961-B21 ✓ Verified by PartsTable
HPE · BATTERY CAPACITOR
WHAT YOU NEED TO KNOW
Very common replacement part Capacitors degrade slower than batteries but still lose capacity over time
CABLE LENGTH IS CRITICAL: 660093-001 = 36" (2U+), 654873-003 = 24" (1U)
PRODUCT OVERVIEW

The HP 782961-B21 is a Battery-Backed Write Cache pack, designed for HPE Smart Array controllers in ProLiant Gen8 and Gen9 servers. It provides backup power to the BBWC module during unexpected power loss, ensuring cached write data is safely committed to flash memory. This is a high-volume replacement part in TPM market as ProLiant Gen8 and Gen9 servers remain widely deployed.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6140-01-686-0212, indicating validated use in U.S. government and defense logistics supply chains.

WHERE IT FITS
782961-B21
NSN: 6140-01-686-0212
FSC: 6140
CAGE: 28480 — HEWLETT-PACKARD COMPANY DBA HP (USA)
SPECIFICATIONS
Part Number782961-B21
ManufacturerHPE
NSN6140-01-686-0212
COMPONENT DIAGRAM
CAP 72V + - CAP 72V BRACKET TO CTRL CABLE: — ~76 mm CACHE BACKUP | Supercapacitor | Cable: — Connects to RAID controller | | Controller: See controller spec SCHEMATIC: + - 2S2P SUPERCAP PACK TITLE CACHE BATT PN 782961-B21 MFR HPE HP 782961-B21 HPE 12W Smart Storage Batt
KEY FEATURES
•
Battery-Backed Write Cache Module
•
Rechargeable Battery Technology
Provides cache backup power for 48+ hours after power loss
•
Hot-Plug Capable
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
TECHNICAL CHARACTERISTICS (FLIS)
PART NAME ASSIGNED BY CONTROLLING AGENCYSMART ARRAY CONTROLLER BATTERIES
SPECIAL FEATURESACTION ID 45383321
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
881089-210Interchangeable
Same NIIN cross-reference
interchangeable
878641-001Interchangeable
Same NIIN cross-reference
interchangeable
782963-001Compatible
HP Smart Array BBWC Battery Pack 12W with 24in Cable 10-Pin Plug for BL Servers
compatible
782963-002Compatible
HP Smart Array BBWC Battery Pack 12W with 24in Cable 10-Pin Plug for BL Servers
compatible
782963-003Compatible
HP Smart Array BBWC Battery Pack 12W with 24in Cable 10-Pin Plug for BL Servers
compatible
786762-001Compatible
HP Smart Array BBWC Battery Pack 12W with 24in Cable 10-Pin Plug for BL Servers
compatible
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99DG Class 9 — LithiumRestricted Air Freight
THIS PART SUBSTITUTES FOR 8
878642-001SUBSTITUTE
HP Smart Array BBWC Battery Pack 12W with 24in Cable 10-Pin Plug for BL Servers
HPE
782963-001SUBSTITUTE
HP Smart Array BBWC Battery Pack 12W with 24in Cable 10-Pin Plug for BL Servers
HPE
782963-002SUBSTITUTE
HP Smart Array BBWC Battery Pack 12W with 24in Cable 10-Pin Plug for BL Servers
HPE
782963-003SUBSTITUTE
HP Smart Array BBWC Battery Pack 12W with 24in Cable 10-Pin Plug for BL Servers
HPE
786762-001SUBSTITUTE
HP Smart Array BBWC Battery Pack 12W with 24in Cable 10-Pin Plug for BL Servers
HPE
827350-001SUBSTITUTE
HP Smart Array BBWC Battery Pack 12W with 24in Cable 10-Pin Plug for BL Servers
HPE
871267-001SUBSTITUTE
HP Smart Array BBWC Battery Pack 12W with 24in Cable 10-Pin Plug for BL Servers
HPE
875240-B21SUBSTITUTE
HP Smart Array BBWC Battery Pack 12W with 24in Cable 10-Pin Plug for BL Servers
HPE
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FREQUENTLY ASKED QUESTIONS
What is 782961-B21?
782961-B21 is a HP 782961-B21 HPE 12W Smart Storage Battery With Plug Connector Manufacturer: HP ItemCondition: REF Model: Alternative Part Numbers: 782961-B21,827350-001,878641-001,878642-001 manufactured by HPE.
What parts can replace 782961-B21?
There are 10 known substitutes for 782961-B21: 881089-210, 878641-001, 782963-001 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 782961-B21?
782961-B21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 6140-01-686-0212. This indicates validated use in U.S. government and defense supply chains.
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Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
Last verified: July 2026