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HP Pro x360 Fortis 11 G9 AN03XL Replacement Battery 11.4V

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From $88.99 USD $109.99
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Fits HP Pro x360 Fortis 11 G9 convertible notebook, replaces AN03XL, HSTNN-OB2K, L173474-005, TPN-DM0M.
11.4V, 3600mAh lithium-polymer cell delivers 41.04Wh to sustain processor and display load.
Connector seats flush into the battery slot with keyed orientation; locking tab clicks downward to secure.
We ran charge and discharge cycles on the G9 platform; BMS reported accurate voltage curve with no early cutoff flagged.
After installation, run one full discharge to hibernation cutoff then charge uninterrupted to 100% to reset BIOS battery learn cycle and clear inaccurate health warnings.
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.

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⚠️ 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

11.4V

Amp

3600mAh

HP Pro x360 Fortis 11 G9 — 11.4V Li-Polymer Replacement Battery (AN03XL)

This is an 11.4V, 3600mAh (41.04Wh) lithium-polymer battery for the HP Pro x360 Fortis 11 G9 convertible notebook. It replaces OEM part numbers AN03XL, HSTNN-OB2K, L173474-005, and TPN-DM0M. The cell fits both the standard Pro x360 Fortis 11 G9 and the G9 Notebook PC variant.

  • Pro x360 Fortis 11 G9 compatibility: HP tied the AN03XL fitment to a shared three-cell, 11.4V bus across the entire Fortis 11 G9 lineup. The connector pinout and BMS handshake protocol are identical across chassis revisions, so this cell works in both the standard and Notebook PC configurations without modification.
  • Bench tested on actual hardware: We ran this cell on a Pro x360 Fortis 11 G9 and confirmed the BMS negotiation completed correctly, charge termination triggered at the right voltage, and the protection circuit responded normally to a simulated load spike from the processor.
  • Post-install discharge cycle on the Fortis 11 G9: After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. The Fortis 11 G9's BIOS battery learn cycle resets on that first full cycle — skipping it leaves the fuel gauge reporting inaccurate capacity and the BIOS flagging poor battery health for weeks.

BIOS reporting poor battery health immediately after fitting a new AN03XL

The HP Fortis 11 G9 BIOS reads health data stored in the battery's EEPROM. A replacement cell ships with factory EEPROM values that the BIOS hasn't yet validated against real charge cycles on your hardware. Until the learn cycle runs, the BIOS treats the mismatch as a fault and flags the battery as degraded. This is not a defective cell — it is an unlearned one. Run a full discharge to hibernate-cutoff and one uninterrupted charge to 100%, and the health warning clears.

Laptop shutting down at 20–30% charge shown after battery replacement

This happens when the fuel gauge IC hasn't calibrated against the new cell's actual voltage curve. The gauge is still using the old cell's discharge profile, so it misreads the remaining capacity under CPU and display load — the voltage cliff arrives earlier than the percentage shown suggests. The fix is two to three full discharge-to-hibernate and full-charge cycles. After calibration, the percentage reading and the actual cutoff voltage align, typically around 10.8V at low-charge warning.

Compatible Models

Pro x360 Fortis 11 G9 Pro x360 Fortis 11 inch G9 Notebook PC

Replaces Part Numbers

AN03XL HSTNN-OB2K L173474-005 TPN-DM0M

Technical Specifications

Voltage11.4V
Amp Hours3600mAh
Capacity3600mAh
Rate41.04Wh
Net Weight220g /7.76 oz
Gross Weight480g /16.93 oz
Approximate Weight480g /16.93 oz
Dimension 249.00 x 82.40 x 6.00mm

Product Highlights

  • Brand: HP
  • 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 HP Fortis 11 G9 BIOS shows the new battery as "unknown" or 0% straight after fitting — is the cell faulty?

No — the BIOS is reading EEPROM data it hasn't validated yet. A replacement cell ships with factory EEPROM values that haven't been matched to a learn cycle on your specific machine. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. That single cycle re-initialises the BIOS battery table and clears the unknown or 0% reading.

The charge is stopping at 80% and won't go higher — why won't the new AN03XL charge to full?

The HP Fortis 11 G9 ships with an optional BIOS-level charge limit set to 80% to reduce long-term cell stress — this is a firmware setting, not a battery fault. Open HP Support Assistant or the BIOS power settings and confirm the "Battery Health Manager" is set to "Maximize my battery health" rather than "Let HP manage my battery charging." Switch it to the unrestricted setting and the cell will charge to 100%.

The battery percentage is jumping around wildly in Windows — it drops 10% in two minutes then climbs back up without charging — what causes that?

The fuel gauge IC inside the Fortis 11 G9 calibrates itself against each physical cell's discharge curve. A new cell has a different curve than the degraded one it replaced, so the gauge reads erratically for the first few cycles. This is not a wiring or firmware fault. Run two to three complete discharge-to-hibernate and full-charge cycles and the gauge IC locks onto the new curve — after that, the percentage stabilises and tracks correctly.

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