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Black rectangular lithium-ion laptop battery, 99Wh 11.4V, for Alienware 15 and 17 models

Beisite

Beisite 9NJM1 99Wh laptop battery for Alienware 15 R3 R4 17 R4 R5

SKU CH-250X-07CMQ

99Wh lithium-ion replacement battery compatible with Alienware 15 R3, R4 and 17 R4, R5 models

  • Battery typeLithium-Ion
  • Battery voltage rating11.4 V
  • Battery capacity99 Wh
  • Product colorBlack
  • Product typeBattery
  • Compatible withFor Alienware 15 R3 R4 17 R4 R5 ALW17C-D1738 Series
  • High 99Wh capacity for longer unplugged sessions
  • 4V lithium-ion chemistry matches original spec
  • Replaces 9NJM1, MG2YH, 31CP6/56/77-2 and other OEM part numbers
  • Fits Alienware 15 R3, R4 and Alienware 17 R4, R5 models
  • Brand-new condition with 12-month warranty coverage

99Wh replacement battery

This 99Wh lithium-ion cell replaces the original 9NJM1 unit in Alienware 15 R3, R4 and Alienware 17 R4, R5 models. It delivers 11.4V and matches the black finish of the factory pack. The part number 31CP6/56/77-2 cross-references to MG2YH, HF250 and other OEM codes. Owners of newer Alienware chassis or thinner ultraportables cannot use this battery.

Fits without adapter or cable changes

The battery slides into the existing bay and connects to the stock motherboard header, so no extra brackets, screws or wiring harnesses are required. It restores full mobile operation for machines that now tether to an AC adapter. Systems lacking the exact Alienware 15 R3-R4 or 17 R4-R5 chassis will not accept the form factor.

Runs at stock voltage with no extra cooling

At 11.4V the cell draws the same current profile as the original pack, so the laptop’s existing thermal solution handles it without modification. Normal workloads keep temperatures and fan noise at factory levels. The 12-month warranty covers defects but does not extend to capacity loss from heavy daily cycling.

How it compares

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

Price $51.99
Pricier than about 83% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand name9NJM1
Model name9NJM1
Part number31CP6/56/77-2
Product colorBlack
Product typeBattery
Power
Battery typeLithium-Ion
Battery voltage rating11.4 V
Battery capacity99 Wh
Compatibility
Compatible withFor Alienware 15 R3 R4 17 R4 R5 ALW17C-D1738 Series

Questions about this item

How long will the 99Wh capacity last before the battery needs recharging under continuous load?

The 99Wh lithium-ion cell stores more energy than lower-capacity packs, so run time between charges is longer; actual hours depend on the laptop's power draw.

Does the 11.4V lithium-ion pack run hot or make noise during all-day use?

The battery is a passive component with no fan or moving parts, so it generates no audible noise; warmth is normal during charge or heavy discharge.

Which Alienware models must I already own for this 9NJM1 battery to fit?

It replaces part numbers 9NJM1, 09NJM1, 0HF250, 0MG2YH, 01D82, 546FF, 0546FF, HF250, MG2YH, P31E001, P31E002, P69F, P69F001, 31CP6/56/77-2 and fits Alienware 15 R3, R4 and 17 R4, R5 series listed.

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