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42T4849 — Lenovo ThinkPad 6 Cell Battery

LENOVO · BATTERY · LITHIUM
PRODUCT OVERVIEW

42T4849: Lenovo ThinkPad 6 Cell Battery.

The LENOVO 42T4849 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→ 42T4849
SPECIFICATIONS
Part Number42T4849
ManufacturerLENOVO
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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 42T4849 MFR LENOVO Lenovo ThinkPad 6 Cell Battery
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 12
42T4706SubstituteBROKER-VERIFIED
Lenovo ThinkPad 6 Cell Battery
substitute
42T4708SubstituteBROKER-VERIFIED
Lenovo ThinkPad 6 Cell Battery
substitute
42T4702SubstituteBROKER-VERIFIED
Lenovo ThinkPad 6 Cell Battery
substitute
42T4704SubstituteBROKER-VERIFIED
Lenovo ThinkPad 6 Cell Battery
substitute
42T4638CompatiblePARTNER
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 25+ - FRU
compatible
42T4666CompatiblePARTNER
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 25+ - FRU
compatible
LIFECYCLE

No lifecycle data available.

THIS PART SUBSTITUTES FOR 20
42T4638SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4666SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4702SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4703SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4704SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4705SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4706SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4707SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4708SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4709SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4731SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4732SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4733SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4734SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4735SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4736SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4737SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4738SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4751SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
42T4752SUBSTITUTE
IBM Notebook Battery 6-Cell 52Wh 10.8V 4.8Ah Li-Ion - ThinkPad 25+ - FRU
LENOVO
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FREQUENTLY ASKED QUESTIONS
What is 42T4849?
42T4849 is a Lenovo ThinkPad 6 Cell Battery manufactured by LENOVO. It is classified as a BATTERY (LITHIUM).
What parts can replace 42T4849?
There are 12 known substitutes for 42T4849: 42T4706, 42T4708, 42T4702 and 9 more. Substitute compatibility should be verified for your specific system.
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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.