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Rectangular black lithium-ion laptop battery, 11.1V 45Wh

Beisite

Beisite laptop battery 11.1V 45Wh for ThinkPad E480 E485 E490 E580 E585 E590 R480 R580

SKU CH-AT17-SWTTC MPN 31CP6/54/90

Replacement lithium-ion battery delivering 11.1 V and 45 Wh for compatible ThinkPad E- and R-series laptops

  • Battery typeLithium-Ion
  • Battery voltage rating11.1 V
  • Battery capacity45 Wh
  • Product colorBlack
  • Product typeBattery
  • Compatible withFor ThinkPad E480 E490 E485 E580 E590 Series
  • New 45 Wh lithium-ion cell restores full run-time
  • 1 V output matches original ThinkPad specifications
  • Replaces 12 Lenovo part numbers including 31CP6/54/90
  • Fits 8 ThinkPad models from E480 to R580
  • Brand-new condition with 12-month supplier warranty

Replacement battery for ThinkPad E and R series

This lithium-ion battery replaces the original 11.1 V 45 Wh pack in ThinkPad E480, E485, E490, E580, E585, E590, R480 and R580 models. It matches the 31CP6/54/90 part number and the L17L3P51, L17M3P51, L17M3P52 and L17C3P51 designations. The pack is supplied new in black.

Practical limits of lithium-ion capacity

A 45 Wh cell delivers runtime proportional to the notebook's power draw; heavy workloads will deplete it faster than light office use. Capacity naturally declines over charge cycles, so maximum runtime reduces gradually after extended service. The battery operates at 11.1 V, the voltage required by the listed ThinkPad models.

Upgrading from a worn or failed original pack

This unit restores full mobile operation when the factory battery no longer holds a useful charge or has swollen. It also serves as a spare for users who need a second pack for travel. It does not increase capacity beyond the original 45 Wh specification, so buyers seeking longer runtime per charge should look elsewhere.

How it compares

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

Price $31.99
Typical for this category: the median of 27,760 items is $30.99.

Specifications

Product
Brand nameL17L3P51 L17M3P51 L17M3P52 L17C3P51
Model nameL17L3P51 L17M3P51 L17M3P52 L17C3P51
Part number31CP6/54/90
Product colorBlack
Product typeBattery
Power
Battery typeLithium-Ion
Battery voltage rating11.1 V
Battery capacity45 Wh
Compatibility
Compatible withFor ThinkPad E480 E490 E485 E580 E590 Series

Questions about this item

Which part number should I pick — 31CP6, 31CP54 or 31CP90?

All three codes refer to the same 11.1 V 45 Wh lithium-ion pack; the supplier ships whichever variant is in stock and they are mutually interchangeable.

What runtime can I expect from the 45 Wh rating in my ThinkPad E480?

A 45 Wh cell typically delivers several hours of mixed office use on an E480, though actual time varies with screen brightness, workload and battery age.

Does this battery use a proprietary Lenovo connector or a standard interface?

It connects via the ThinkPad internal battery header used on the E480, E485, E490, E580, E585, E590, R480 and R580 series.

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