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Black rectangular lithium-ion laptop battery with connector on one side

Beisite

Beisite 87Wh laptop battery for Alienware X15 R1 X17 RTX 3080 P48E 31CP6/51/73-2

SKU CH-76N4-CPCPB

87 Wh lithium-ion replacement battery at 11.4 V for Alienware X15 R1 and X17 models

  • Battery typeLithium-Ion
  • Battery voltage rating11.4 V
  • Battery capacity87 Wh
  • Product colorBlack
  • Product typeBattery
  • Compatible withFor Alienware X15 R1 X17
  • 87 Wh capacity powers extended sessions away from mains
  • 4 V lithium-ion chemistry matches original specifications
  • Replaces part numbers 31CP6/51/73-2 for direct swap
  • Fits Alienware X15 R1 and X17 RTX 3080 models
  • Supplied new with 12 month warranty included

Compatible laptop models

This 87Wh lithium-ion battery replaces part number 31CP6/51/73-2 in Alienware X15 R1 and X17 RTX 3080 P48E systems. It also fits the Inspiron 16 7620 2-in-1 and Alienware X15 R1 NAWX15R101. The pack restores original runtime for owners of these specific laptops.

What the package includes

The box contains one black battery and no additional tools, cables or software. Installation relies on the laptop’s existing screws and connectors, so no extra hardware is required. The 12-month warranty covers defects in materials or workmanship from the date of purchase.

Build quality and daily use

The lithium-ion cells deliver 11.4V at 87Wh capacity, matching the factory voltage and energy rating. A precise mould ensures the pack seats flush in the chassis without gaps or forced alignment. Direct-fit connectors mean the battery clicks into place and the laptop recognises it immediately on first boot.

How it compares

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

Price $62.99
Pricier than about 90% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameDWVRR
Model nameDWVRR
Part number31CP6/51/73-2
Product colorBlack
Product typeBattery
Power
Battery typeLithium-Ion
Battery voltage rating11.4 V
Battery capacity87 Wh
Compatibility
Compatible withFor Alienware X15 R1 X17

Questions about this item

How many charge cycles can the 87Wh lithium-ion battery handle before it needs replacing?

The battery is rated for 12 months of warranty coverage; actual cycle life varies with usage patterns and charging habits.

Will the 11.4V 87Wh pack throttle under continuous RTX 3080 load in an Alienware X17?

Sustained high-wattage draw from the GPU can trigger the pack's internal protection circuit, limiting output until temperature drops.

Does the replacement 31CP6/51/73-2 run hot or loud during all-day use in an X15 R1?

The battery has no moving parts, so it produces no noise; warmth is normal under load but stays within the cell's 11.4V design envelope.

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