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46C9040 — Battery Module Specs

IBM · BATTERY · LITHIUM
WHAT YOU NEED TO KNOW
Lithium batteries are restricted for air travel and may require a dangerous goods certificate with additional carrier fees. Ground shipping adds transit time — plan accordingly. Always check the date code, batteries degrade over time. Buy in bulk when possible, these are consumables.
RESTRICTED for air — DG certificate required
PRODUCT OVERVIEW
IBM LI-ION BATTERY (46C9040)

The IBM 46C9040 is a Battery-Backed Write Cache pack, designed for enterprise RAID controllers in enterprise 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 enterprise servers remain widely deployed.

WHERE IT FITS
BATTERY→ LITHIUM→ 46C9040
SPECIFICATIONS
Part Number46C9040
ManufacturerIBM
FITS THESE MACHINES
Lenovo System x iDataPlex dx360 Server M3
Lenovo System x x3250 M2
Lenovo System x x3500 M3
Lenovo System x x3550 M3
Lenovo System x x3650 M3
Lenovo System x3200 M3
Lenovo System x3250 M3
Lenovo System x3400 M3
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 46C9040 MFR IBM IBM Li-Ion Battery (46c9040)
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
SUBSTITUTES & CROSS-REFERENCES 9
46M0857CompatiblePARTNER
IBM Cache Battery for ServeRAID M5000 Series - SBB
compatible
46M0885CompatiblePARTNER
IBM Cache Battery for ServeRAID M5000/MR10i/is/M - P/N
compatible
46C9084CompatiblePARTNER
IBM Cache Battery for ServeRAID MR10i/is/M - Option
compatible
46C9044CompatiblePARTNER
IBM Cache Battery for ServeRAID MR10i/is/M - P/N
compatible
43W4342CompatiblePARTNER
IBM Cache Battery for ServeRAID M5000/MR10i/is/M - FRU
compatible
81Y4419CompatiblePARTNER
IBM Cache Battery for ServeRAID M5000/MR10i/is/M - P/N
compatible
LIFECYCLE

No lifecycle data available.

THIS PART SUBSTITUTES FOR 2
46C9044SUBSTITUTE
IBM Cache Battery for ServeRAID MR10i/is/M - FRU
IBM
46C9084SUBSTITUTE
IBM Cache Battery for ServeRAID MR10i/is/M - FRU
IBM
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FREQUENTLY ASKED QUESTIONS
What is 46C9040?
46C9040 is a IBM Li-Ion Battery (46c9040) manufactured by IBM. It is classified as a BATTERY (LITHIUM).
What parts can replace 46C9040?
There are 9 known substitutes for 46C9040: 46M0857, 46M0885, 46C9084 and 6 more. Substitute compatibility should be verified for your specific system.
Is 46C9040 still available?
46C9040 is currently Unknown.
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PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.