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Black rectangular lithium-ion laptop battery with connector pins

Beisite

Beisite 45N1120 45N1122 45N1121 45N1123 laptop battery 11.1V 48Wh

SKU CH-6QS3-4GTGJ

11.1V 48Wh lithium-ion replacement battery for ThinkPad T431s series laptops

  • Battery typeLithium-Ion
  • Battery voltage rating11.1 V
  • Battery capacity48 Wh
  • Product colorBlack
  • Product typeBattery
  • Compatible withFor ThinkPad T431s
  • 1V 48Wh lithium-ion cell restores full runtime for ThinkPad T431s
  • Replaces four OEM part numbers including 45N1120 and 45N1123
  • Black finish matches original chassis colour exactly
  • Brand-new condition with 12-month supplier warranty
  • Ships as any compatible variant 45N1120 45N1121 45N1122 45N1123

Replacement battery for ThinkPad T431s

This 11.1V 48Wh lithium-ion pack replaces Lenovo part numbers 45N1120 45N1121 45N1122 45N1123 and FRU 45N1123. It fits ThinkPad T431s models including 20A913U and 20AA0010AU. The unit ships new with a twelve-month warranty.

Black lithium-ion cell with direct-fit connectors

The battery matches the original form factor so it seats in the T431s bay without adapters or cable changes. Its black finish aligns with the chassis colour. One battery is included in the package.

48Wh capacity decides runtime

At 48Wh the pack delivers the same energy rating as the factory unit. Buyers who need higher capacity for longer unplugged sessions will not find it here. Verify your original part number before ordering.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $41.99
Pricier than about 73% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand name45N1120 45N1122 45N1121 45N1123
Model name45N1120 45N1122 45N1121 45N1123
Part numberASM 45N1122
Product colorBlack
Product typeBattery
Power
Battery typeLithium-Ion
Battery voltage rating11.1 V
Battery capacity48 Wh
Compatibility
Compatible withFor ThinkPad T431s

Questions about this item

Does the 11.1 V lithium-ion chemistry set a hard limit on charge cycles?

The pack is rated at 11.1 V and 48 Wh; lithium-ion cells typically deliver several hundred full cycles before capacity drops noticeably.

What physical space does the battery occupy inside a ThinkPad T431s?

It fits the standard internal battery bay of the ThinkPad T431s, T431s-20A913U and 20AA0010AU models.

How is the battery installed and which step is often missed?

Power off the laptop, disconnect the AC adapter, release the battery latch, swap the pack, then re-enable the internal battery in BIOS if the system does not detect it automatically.

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