PartsTable
Technical Data Sheet
42T4911 ✓ Verified by PartsTable
LENOVO · 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 LENOVO 42T4911 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 42T4911
SPECIFICATIONS
TypeBattery
Product colourBlack
Battery voltage10.8 V
Battery capacity57 Wh
Quantity per pack1 pc(s)
Battery technologyLithium-Ion (Li-Ion)
Compatible productsT410/20/30, T510/20/30, W510/20/30, L410/12/20/21/30, L510/12/20/30
Harmonized System (HS) code84732990
Number of batteries included1 pc(s)
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 42T4911 MFR LENOVO Lenovo ThinkPad Battery 70+ (6 cell)
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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
42T4790Compatible
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - APN
compatible
42T4791Compatible
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
compatible
42T4792Compatible
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - APN
compatible
42T4793Compatible
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
compatible
42T4794Compatible
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - APN
compatible
42T4795Compatible
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
compatible
LIFECYCLE
StatusUNKNOWN
Availability
RoHS CompliantEAR99ESD SensitiveDG Class 9 — LithiumRestricted Air Freight
THIS PART SUBSTITUTES FOR 20
42T4790SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4791SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4792SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4793SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4794SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4795SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4796SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4797SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4818SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4819SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4852SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4920SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4921SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4922SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4923SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4924SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4925SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4926SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4927SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
57Y4185SUBSTITUTE
IBM Notebook Battery 6-Cell 57Wh 10.8V 5.2Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
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FREQUENTLY ASKED QUESTIONS
What is 42T4911?
42T4911 is a Lenovo ThinkPad Battery 70+ (6 cell) manufactured by LENOVO. It is classified as a BATTERY (LITHIUM).
What parts can replace 42T4911?
There are 12 known substitutes for 42T4911: 42T4790, 42T4791, 42T4792 and 9 more. Substitute compatibility should be verified for your specific system.
Is 42T4911 still available?
42T4911 is currently Unknown.
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