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Black rectangular lithium-ion laptop battery with label showing 11.4V 76Wh

Beisite

Beisite Y9M6F laptop battery 11.4V 76Wh for Alienware M15 M17 R2

SKU CH-WHT0-ZF3SP

A 76 Wh, 11.4 V lithium-ion replacement battery for Alienware M15 R2 and M17 R2 models

  • Battery typeLithium-Ion
  • Battery voltage rating11.4 V
  • Battery capacity76 Wh
  • Product colorBlack
  • Product typeBattery
  • Compatible withFor Alienware M15 ALW15MD4725 W R2 ALW15M-R4958 W R2 Series
  • 76 Wh capacity powers Alienware M15 and M17 R2 models for longer sessions
  • 4 V lithium-ion cell matches original voltage for stable operation
  • Replaces eight OEM part numbers including Y9M6F, P41E and P87F for exact fit
  • Fits multiple chassis codes such as ALW15MD4725W and ALW15M-R4958W without modification
  • Brand new unit supplied with 12 month warranty for confidence

Direct replacement for Alienware M15 and M17 R2

This 11.4V lithium-ion battery restores original runtime to compatible Dell Alienware M15 R2 and M17 R2 models. It matches the 76Wh capacity and 31CP5/55/82-2 part number used in factory configurations. The black pack fits the same chassis without modification.

Low heat output during typical workloads

Normal operation keeps temperatures modest because the cell chemistry is optimised for steady discharge rather than peak current. Power draw stays within the laptop's original thermal envelope, so fan behaviour remains unchanged. No additional noise is introduced by the replacement.

Consistent output through extended sessions

Under sustained load the pack maintains stable voltage without the sharp drops seen in aged cells. The 76Wh rating supports long work or gaming periods before recharge is needed. Capacity retention follows standard lithium-ion curves over the 12 month warranty period.

How it compares

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

Price $49.99
Pricier than about 82% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameY9M6F
Model nameY9M6F
Part number31CP5/55/82-2
Product colorBlack
Product typeBattery
Power
Battery typeLithium-Ion
Battery voltage rating11.4 V
Battery capacity76 Wh
Compatibility
Compatible withFor Alienware M15 ALW15MD4725 W R2 ALW15M-R4958 W R2 Series

Questions about this item

How do I install the Y9M6F battery in my Alienware M15 R2 and which step do people usually miss?

Power off the laptop, disconnect the AC adapter, remove the base screws, unplug the old battery connector before lifting it out, then connect the new 11.4V 76Wh pack and reassemble — the step most often missed is unplugging the old battery first.

What maintenance or replacement will the Y9M6F lithium-ion battery need later?

The 76Wh lithium-ion pack will gradually lose capacity; plan to replace it once runtime drops below your needs, typically after several hundred charge cycles.

What limit appears first on the Y9M6F during sustained heavy use?

The 76Wh capacity sets the runtime ceiling, so under continuous load the battery will deplete before any other limit is reached.

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