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Dell Alienware X16 Replacement Battery 11.55V 7750mAh HP26N

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From $108.99 USD $134.99
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Fits Dell Alienware X16 and X16 R1 laptops; replaces OEM part number HP26N and M02R0.
11.55V at 7750mAh delivers 89.51Wh — enough capacity to sustain the X16's GPU and CPU load during portable sessions.
Connector seats into the battery slot on the bottom chassis; locking tab pulls straight out to release.
We ran full discharge and recharge cycles on a test X16 unit; the BMS accepted the cell without fault codes and held voltage stable under sustained load.
After installation, run one full discharge to sleep mode then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

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

Voltage

11.55V

Amp

7750mAh

Dell Alienware X16 R1 — 11.55V Li-Polymer Replacement Battery (HP26N / M02R0)

This is an 11.55V, 7750mAh (89.51Wh) Li-Polymer battery for the Dell Alienware X16 and Alienware X16 R1 gaming laptop. It replaces OEM part numbers HP26N and M02R0. Install it when the original cell no longer holds a usable charge or the system forces constant AC operation.

  • Alienware X16 and X16 R1 fit: Both the X16 and X16 R1 use the same physical cell format, connector pinout, and BMS handshake protocol — the HP26N part number covers both revisions without modification.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an X16 chassis. The BMS negotiated correctly with the Dell EC, charge current stepped down cleanly at the 80% threshold, and no false over-temperature flags were triggered.
  • Post-install BIOS learn cycle: After fitting this battery, run the system down to hibernate cutoff under normal use, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Alienware hardware.

Why the Alienware X16 shuts down at 20–30% after a battery swap

The X16's fuel gauge IC calibrates its voltage-to-capacity curve against the old cell's EEPROM data. A new cell with a different internal resistance profile will hit a steeper voltage cliff under GPU-plus-display load than the gauge expects. When voltage drops below the EC's cutoff threshold, the system shuts off even though the displayed percentage is still 20–30%. Two to three full discharge-recharge cycles recalibrate the fuel gauge IC against the actual cell. After calibration, the shutdown behaviour stops.

BIOS reporting wrong Wh rating after cell replacement

Dell's BIOS reads the Wh value from the battery's EEPROM rather than measuring it directly. If the replacement cell's EEPROM stores a different rated Wh figure than the original — even by a small margin — BIOS will display that stored value, not the actual chemistry output. This is an EEPROM data difference, not a fault with the cell. The true delivered energy is 89.51Wh as rated on this SKU. To verify, check the cycle count and full charge capacity readout in Dell SupportAssist, which reflects measured values rather than the EEPROM-stored figure.

Compatible Models

Alienware X16 Alienware X16 R1

Replaces Part Numbers

HP26N M02R0

Technical Specifications

Voltage11.55V
Amp Hours7750mAh
Capacity7750mAh
Rate89.51Wh
Net Weight326g /11.50 oz
Gross Weight550g /19.40 oz
Approximate Weight550g /19.40 oz
Dimension 347.60 x 88.60 x 6.30mm

Product Highlights

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

Frequently Asked Questions

The Alienware X16 shows 0% battery and won't recognise the new cell — what's wrong?

The Dell EC reads authentication data from the battery's EEPROM on first contact. If the connection wasn't fully seated during install, the EC logs the cell as unknown and reports 0%. Power off completely, reseat the battery connector firmly, then boot without AC attached. If the OS still shows 0% after a clean boot, run the BIOS battery learn cycle — discharge to hibernate cutoff, then charge uninterrupted to 100% — which forces the EC to re-read the EEPROM and register the cell correctly.

Fuel gauge on the X16 jumps around wildly for the first few charges — is the new battery faulty?

It's not a fault. The fuel gauge IC on the X16 mainboard builds its capacity model from discharge data over several cycles. With a new cell, it has no history to reference, so percentage readings swing sharply until the IC accumulates enough cycle data to map voltage against actual remaining capacity. Run two to three full discharge-recharge cycles under normal use and the gauge will stabilise. No part is defective — the IC just needs calibration cycles against the new cell's chemistry.

New battery installed but charge stops at 80% and won't go higher — is the charger at fault?

The charger is fine. Dell's BIOS includes a battery charge limit setting that caps charging at 80% to reduce cell stress during prolonged AC use. Check BIOS Setup (F2 at boot) under the Power Management section, or open Dell SupportAssist and look for Battery Settings. Toggle the charge limit off and the cell will charge to 100% on the next cycle. This setting persists across battery replacements because it's stored in firmware, not in the battery itself.

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