Wymisnit 99Wh 9NJM1 Battery for Dell Alienware 15/17

The Wymisnit 99Wh (9NJM1) Li-ion replacement battery restores full portable power to compatible Dell Alienware 15 and 17 series laptops with a high-capacity, OEM-grade cell design.

If your Alienware laptop is losing runtime or refuses to hold a charge, this 99Wh 9NJM1 battery is built as a direct-fit replacement for a wide range of Dell/Alienware part numbers. It delivers 8820mAh at 11.4V using six high-density cells, arrives brand new with basic installation tools, and includes built-in protection circuitry to help guard against overcharge, overdischarge, overheating, and short circuits.

Which Alienware models and part numbers does this battery fit?

This Wymisnit battery is designed to replace the factory pack in many Alienware 15 and 17 generations and specific chassis codes. Confirm your laptop's service tag or original battery part number before ordering to ensure compatibility.

• Supports Alienware 15 R3 (15R3), 15 R4 (15R4) series and Alienware 17 R4 (17R4), 17 R5 (17R5) series.
• Compatible part numbers include 9NJM1, 09NJM1, MG2YH, 0MG2YH, 01D82, 0546FF, 44T2R, HF250, 0HF250.
• Works with chassis codes P31E/P69F and ALW17C-* series (D1738, D1748, D1758, D1848, D2738, D2748, D2758, R1748).

How long will this battery power my laptop and what are the specs?

The pack provides 99Wh of energy—8820mAh at 11.4V—so runtime will vary by workload, screen brightness, and connected peripherals. The battery uses six A+ grade cells and is manufactured to match OEM electrical and physical specifications for a reliable fit and stable power delivery.

• Capacity: 99Wh / 8820mAh; Voltage: 11.4V; Chemistry: Li-ion; Cells: 6 A+ cells.
• 100% brand-new pack assembled with factory-grade circuit boards and connectors.
• Arrives with two screwdrivers to ease removal and installation.

What safety and durability features are included?

Wymisnit builds this replacement battery with safety circuits and quality components to reduce risk and extend usable life. The pack includes protections common in modern laptop batteries and is rated for hundreds of recharge cycles under normal use.

• Overcharge/overdischarge protection and short-circuit prevention built into the battery management board.
• Over-temperature safeguards and quality control testing to meet OEM-like standards.
• Expected service life includes up to ~500 recharge cycles when used under recommended conditions.

Who is this for: The Wymisnit 99Wh 9NJM1 battery is aimed at Alienware owners who need a high-capacity, plug-and-play replacement—whether to restore lost runtime, replace a failing pack, or carry a fresh spare for long sessions away from power. It suits gamers, power users, and technicians who require a direct-fit battery compatible with multiple Dell/Alienware part numbers and chassis variants. If you rely on extended unplugged use and want a tested, protected Li-ion battery with included tools and a two-year support option, this replacement is a practical choice. Always verify your laptop's exact part number or service tag before purchasing, and follow manufacturer guidance for safe installation and disposal.