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PartsTable / BATTERY / 42T4921
42T4921 ✓ Verified by PartsTable
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. Key checks: Buy in bulk — consumables.
RESTRICTED for air — DG certificate required
PRODUCT OVERVIEW

Lenovo Battery pack 6 cell Li-ion (2.2 Ah). Key specifications include Type: Battery, Product colour: Black, Battery voltage: 10.8 V, Battery capacity: 4400 mAh, Quantity per pack: 1 pc(s), Battery technology: Lithium-Ion (Li-Ion). Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
BATTERY→ LITHIUM→ 42T4921
SPECIFICATIONS
TypeBattery
Product colourBlack
Battery voltage10.8 V
Battery capacity4400 mAh
Quantity per pack1 pc(s)
Battery technologyLithium-Ion (Li-Ion)
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR MFR: IBM Lenovo Battery pack 6 cell Li-ion (2.2 Ah) TITLE COMPONENT PN 42T4921 MFR IBM Lenovo Battery pack 6
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 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4791SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4792SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4793SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4794SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4795SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4796SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4797SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4818SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4819SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4852SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4911SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4920SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4922SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4923SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4924SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4925SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4926SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
42T4927SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
57Y4185SUBSTITUTE
IBM Notebook Battery 6-Cell 48Wh 10.8V 4.4Ah Li-Ion - ThinkPad 55+ - FRU
LENOVO
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FREQUENTLY ASKED QUESTIONS
What is 42T4921?
42T4921 is a Lenovo Battery pack 6 cell Li-ion (2.2 Ah) manufactured by IBM. It is classified as a BATTERY (LITHIUM).
What parts can replace 42T4921?
There are 12 known substitutes for 42T4921: 42T4790, 42T4791, 42T4792 and 9 more. Substitute compatibility should be verified for your specific system.
Is 42T4921 still available?
42T4921 is currently Unknown.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026