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4M529 ✓ Verified by PartsTable
DELL · 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. Key checks: Buy in bulk — consumables.
RESTRICTED for air — DG certificate required
PRODUCT OVERVIEW

The Dell 4M529 is a Battery-Backed Write Cache pack, designed for Dell PERC controllers in PowerEdge 12th and 13th generation 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 PowerEdge 12th and 13th generation servers remain widely deployed.

WHERE IT FITS
BATTERY→ LITHIUM→ 4M529
SPECIFICATIONS
TypeBattery
Product colourBlack
Battery capacity90 Wh
Quantity per pack1 pc(s)
Battery technologyLithium
Brand compatibilityDELL
Number of battery cells9
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 4M529 MFR DELL Dell 90Whr 9-Cell Lithium-Ion Primary
KEY FEATURES
•
Battery-Backed Write Cache Module
•
Rechargeable Battery Technology
Provides cache backup power for 48+ hours after power loss
•
Hot-Plug Capable
VERIFIED SUBSTITUTES & CROSS-REFERENCES

No verified substitutes available.

LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveDG Class 9 — LithiumRestricted Air Freight
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FREQUENTLY ASKED QUESTIONS
What is 4M529?
4M529 is a Dell 90Whr 9-Cell Lithium-Ion Primary manufactured by DELL. It is classified as a BATTERY (LITHIUM).
Is 4M529 still available?
4M529 is currently Unknown.
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Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
Last verified: July 2026