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USAbatteries.com stocks 8 compatible replacement batteries for the Alienware 15 series. Replacement batteries in this category are priced from $73.99 to $88.99.

The Alienware 15 is Dell’s high-performance gaming line, built across five revisions (R1 through R5) from roughly 2015 to 2019. It is aimed at enthusiast gamers, content creators, and power users who want strong graphics and processors in a robust 15-inch form factor. The series spans two distinct design eras, the R1/R2 generation and the later hinge-forward R3, R4, and R5 generation.

These models use lithium-ion batteries at 14.8V in the early generation, with capacities ranging from about 68Wh to 99Wh across the line, and cell counts that vary from 6-cell to 8-cell packs. Part numbers change by sub-series and year, so matching your exact revision matters. For example, an Alienware 15 R2 typically takes an 8-cell 92Wh battery (parts like 191YN or 2F3W1), while an Alienware 15 R3 uses a different 6-cell pack (parts like 9NJM1 or MG2YH), and the two are physically incompatible.

Always confirm your exact model number and the part number printed on your current battery before ordering.

Alienware 15 Battery Specifications

Cell chemistry	Lithium-ion
Price range	$73.99 to $88.99

Frequently Asked Questions

What battery does the Alienware 15 use?

It depends on your revision. An Alienware 15 R1 or R2 uses an 8-cell, 92Wh, 14.8V internal battery, with common part numbers like 191YN and 2F3W1. The later R3, R4, and R5 revisions use a 6-cell battery (often 99Wh) with part numbers such as 9NJM1, 44T2R, MG2YH, and XRGXX. These two groups are physically incompatible, so check your part number before ordering. Replacement packs in this category run from $73.99 to $88.99.

How do I find the right battery for my Alienware 15 model?

Start by identifying your revision (R1, R2, R3, R4, or R5), since the early and late generations use different battery shapes. Then read the part number printed on your original battery, for example 191YN on an R1/R2 or MG2YH on an R3 through R5. Match that part number or your exact model to the listing. The R1/R2 era uses an 8-cell 92Wh pack, while the R3 through R5 era uses a 6-cell battery, and the two will not swap.

How much does an Alienware 15 replacement battery cost?

Replacement batteries for the Alienware 15 in this category range from $73.99 to $88.99. The exact price depends on your revision and the capacity of the pack, since the 8-cell 92Wh batteries used in the R1 and R2 differ from the 6-cell batteries (often 99Wh) used in the R3, R4, and R5. Confirm your part number, such as 2F3W1 or 9NJM1, to match the correct battery to your model.

Are Alienware 15 batteries interchangeable?

Not across the whole line. The R1 and R2 share an 8-cell, 92Wh, 14.8V battery (parts like 191YN and 2F3W1), so those two are compatible with each other. The R3, R4, and R5 use a different 6-cell pack (parts like MG2YH and 9NJM1) with a layout that fits the hinge-forward chassis. The two generations are physically incompatible, so always confirm your revision and part number before buying.

What differs between the Alienware 15 sub-series batteries?

The main difference is the design era. The R1 and R2 use an 8-cell, 92Wh battery at 14.8V with a long, slender shape that sits below the palm rest, using parts like 191YN. The R3, R4, and R5 switched to a hinge-forward internal layout and a 6-cell battery, often 99Wh, with parts like 9NJM1, 44T2R, MG2YH, and XRGXX. Capacity, cell count, and physical shape all change between these groups, so the packs do not interchange.

Where do I find the battery part number?

Look on the label of your original battery inside the laptop, where the part number is printed directly. For an Alienware 15 R1 or R2 you will see codes like 191YN or 2F3W1, while an R3 through R5 shows codes like 9NJM1, 44T2R, MG2YH, or XRGXX. You can also check the capacity listed in watt-hours (Wh) on that same label, which helps confirm whether you have the 92Wh or 99Wh pack.

Can I replace the Alienware 15 battery myself?

Yes, with basic tools. Every revision in this line uses an internal battery, so you remove the bottom panel, disconnect the original pack, and unscrew it from the chassis. On R1 and R2 the 8-cell, 92Wh battery sits below the palm rest, while on R3 through R5 the 6-cell pack follows the hinge-forward layout. Power down, unplug the adapter, and verify your part number (for example MG2YH) matches the replacement before installing.

What are the signs the Alienware 15 battery needs replacing?

Common signs include much shorter runtime than when new, the laptop shutting down suddenly even with charge remaining, or the system only running when plugged in. You may also notice the battery refusing to charge past a low percentage. Since these high-capacity 92Wh and 99Wh packs work hard during gaming, performance can fade over time. If your original pack (such as 191YN or 9NJM1) shows these symptoms, match its part number to a replacement in the $73.99 to $88.99 range.