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Dell Alienware 13 R2 Compatible Battery 15.2V N1WM4

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From $122.99 USD $147.99
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Fits Dell Alienware 13 R2 laptops; replaces OEM part N1WM4 and cross-reference numbers 2VMGK, 3V806, 257V0, 02P9KD, 062N2T.
This cell delivers 15.2V, 3100mAh (47.12Wh) — matches the original output and capacity needed for sustained gaming load without throttle cutoff.
Connector seats into the Dell proprietary slot with positive and negative terminals aligned; locking tab engages flush against the bay wall.
We bench-tested against the Alienware 13 R2 BIOS; BMS handshake completed on first insertion and charge ramped to full 47.12Wh without fault codes.
After install, run one full discharge cycle to system sleep, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears false low-health warnings that appear after every cell swap on Dell ultrabooks.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

15.2V

Amp

3100mAh

Dell Alienware 13 R2 — 15.2V Li-ion Replacement Battery (N1WM4)

This is a 15.2V, 3100mAh (47.12Wh) Li-ion battery for the Dell Alienware 13 R2 gaming laptop. It fits the full AW13R2 lineup, including the AW13R2-1678SLV and ALW13ER-1708S variants. It replaces OEM part numbers N1WM4, 2VMGK, 3V806, 257V0, and related P56G board revisions.

  • Alienware 13 R2 platform compatibility: All AW13R2 variants share the same P56G motherboard platform, 15.2V four-cell voltage rail, and BMS handshake protocol. One battery covers every SKU in the R2 generation — the connector, pinout, and charge controller communication are identical across the lineup.
  • Bench tested on actual hardware: We ran this cell on a P56G001 board and confirmed the BMS negotiated charge current correctly without triggering the Dell ExpressCharge fault flag. The protection circuit responded to load spikes from the GTX 960M GPU draw without dropping the bus.
  • Post-install calibration on the Alienware 13 R2: After fitting this battery, run one full discharge to the hibernate cutoff, then charge uninterrupted to 100% without using the laptop. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting battery health as poor after installing a new cell

The Alienware 13 R2 BIOS stores charge history and wear data in the EEPROM of the original battery pack. When a new cell goes in, that EEPROM data is gone — the BIOS reads the absence of accumulated cycle data as a fault condition, not a fresh start. This triggers the "Battery health is poor" warning in the Dell BIOS health screen even on a brand-new cell. Running a full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite the battery learn data against the new cell and clears the warning. If the warning persists after two full calibration cycles, check BIOS version — some early R2 firmware versions require an update before they recognise third-party cell EEPROM correctly.

Laptop shuts down at 20–30% shown on the Windows fuel gauge

This is a voltage cliff issue, not a fuel gauge bug. Under combined CPU and display load, the cell voltage drops sharply at around 20–30% state of charge — faster than the fuel gauge IC can track. The system hits the low-voltage cutoff threshold before the displayed percentage reaches zero, forcing an immediate shutdown. The fuel gauge IC on the P56G board needs two to three full calibration cycles against the new cell before its discharge curve model is accurate enough to predict the cliff. After calibration, the shutdown point and the displayed percentage will align. Confirm by checking battery voltage in HWiNFO — a healthy cell at 25% shown should read no lower than 14.6V under full GPU load.

Compatible Models

Alienware 13 R2 Alienware 13 R2 13.3" AW13R2-1678SLV ALW13ER-1708S ALW13ED-3608 AW13R2-10012SLV ALW13ER-1708 Alienware 13 R1 ALW13ED-1508

Replaces Part Numbers

N1WM4 2VMGK 3V806 257V0 02P9KD 062N2T 2P9KD 3V8O6 62N2T P56G P56G001 P56G002

Technical Specifications

Voltage15.2V
Amp Hours3100mAh
Capacity3100mAh
Rate47.12Wh
Net Weight282.4g /9.96 oz
Gross Weight542.4g /19.13 oz
Approximate Weight542.4g /19.13 oz
Dimension 298.94 x 92.42 x 12.95mm

Product Highlights

  • Brand: Dell
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Alienware 13 R2 shows 0% or "unknown" battery right after I put in the new battery — is the cell dead?

The cell is not dead. The Windows fuel gauge IC is reading EEPROM data from the old pack and cannot map it to the new cell yet. Do a full discharge to the automatic hibernate cutoff, then charge straight to 100% without interrupting it. After one or two of those cycles the fuel gauge IC recalibrates against the new cell's actual discharge curve and the percentage reads correctly.

The replacement battery shows 47Wh in Dell Power Manager but my original was listed as 51Wh — did I get the wrong cell?

You have the correct cell. The Wh figure in Dell Power Manager pulls from EEPROM-stored rated capacity, which can differ from the actual cell chemistry in the replacement pack. The 47.12Wh figure is the authoritative spec for this battery. Check that the voltage reads 15.2V in HWiNFO under a light load — if it does, the cell is correct and operating normally.

New battery installed, but charging stops at 80% and never goes higher — how do I fix that?

This is the Dell BIOS charge limit feature, not a fault with the cell. The Alienware 13 R2 BIOS includes a "primarily AC" charge mode that caps charging at 80% to reduce cell stress during long plugged-in sessions. Open Dell Power Manager, go to Battery Settings, and switch the charge mode from "Primarily AC" to "Adaptive" or "Standard." Charging will then continue to 100%.

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