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HP Spectre x360 13 Replacement Battery CP03XL 11.1V 4300mAh

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From $107.99 USD $129.99
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Fits HP Spectre x360 13 Convertible; replaces CP03XL, HSTNN-LB8E, 929066-421, and 929072-855.
11.1V at 4300mAh capacity sustains the Spectre x360's touchscreen and processor load without mid-cycle voltage sag.
Connector mates directly to the Spectre x360 13 mainboard slot; no adapter needed, locking tab engages on insertion.
We bench-tested this cell in the Spectre x360 platform; BMS accepted the pack on first charge, fuel gauge calibrated within two full cycles.
After installation, discharge the laptop fully to hibernate-cutoff, 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 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

11.1V

Amp

4300mAh

HP Spectre x360 13 Convertible — 11.1V Li-Polymer Replacement Battery (CP03XL)

This is an 11.1V, 4300mAh (47.73Wh) Li-Polymer replacement battery for the HP Spectre x360 13 Convertible series. It fits the Spectre x360 Convertible 13, 13t, and related convertible configurations covered under OEM part numbers CP03XL, CP03060XL, HSTNN-LB8E, 929066-421, and 929072-855. The cell dimensions are 264.95 x 128.00 x 4.05mm — physically identical to the factory unit.

  • Spectre x360 13 platform fit: These models share the same three-cell Li-Polymer configuration, 11.1V nominal voltage rail, and matching BMS connector pinout — which is why a single part number spans all x360 13 convertible variants listed above.
  • Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on a Spectre x360 13 unit. The BMS handshake completed at first boot, BIOS recognised the cell, and charge control stepped through CC-CV phases without interruption.
  • Post-install calibration on the Spectre x360: After fitting this battery, run one full discharge to hibernate-cutoff, 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 this platform.

BIOS reporting battery health as poor after replacement on the Spectre x360

The Spectre x360 BIOS reads health data stored in the old cell's EEPROM and carries that degraded reading across to the new cell on first boot. The new cell has no charge history, so the fuel gauge IC has no reference point yet. This is not a fault with the replacement — it is a calibration gap. Running two full discharge-to-hibernate and charge-to-100% cycles gives the fuel gauge IC enough data to overwrite the stale EEPROM values and report accurately.

Spectre x360 shutting down at 20–30% charge shown on screen

This symptom means the cell voltage is hitting its low-cutoff threshold well before the OS fuel gauge reaches zero. Under combined CPU and display load, the Spectre x360 13 draws enough current to cause a voltage cliff — the cell drops below the BMS cutoff voltage while the OS still shows charge remaining. The fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. Run two full uninterrupted discharge cycles to hibernate-cutoff, then charge to 100% each time — the gauge recalibrates to the real cutoff point, typically around 10.5V per cell cluster.

Compatible Models

Spectre x360 13 Convertible Spectre x360 Convertible Spectrex360 Convertible 13 Spectre x360 Convertible 13t Spectre 13-ae006no X360 Spectre X360 13-ae000 Spectre X360 13-ae001ng SPECTRE X360 13-AE001TU Spectre X360 13-ae002ng Spectre X360 13-AE002TU Spectre X360 13-ae003ng Spectre X360 13-AE003TU Spectre X360 13-ae004ng Spectre X360 13-AE004TU Spectre X360 13-AE005TU Spectre X360 13-AE006TU Spectre X360 13-AE007TU Spectre X360 13-ae010nd Spectre X360 13-ae010tu Spectre X360 13-ae013dx SPECTRE X360 13-AE027TU Spectre X360 13-ae030ng Spectre X360 13-ae034ng Spectre X360 13-ae035ng Spectre X360 13-ae039ng Spectre X360 13-ae040ng Spectre X360 13-ae041ng Spectre X360 13-ae042ng Spectre X360 13-ae043ng Spectre X360 13-ae044ng Spectre X360 13-ae045ng Spectre X360 13-ae046ng Spectre X360 13-ae047ng Spectre X360 13-ae048ng Spectre X360 13-ae049ng SPECTRE X360 13-AE502TU Spectre X360 13-ae503t

Replaces Part Numbers

CP03XL CP03060XL HSTNN-LB8E 929066-421 929072-855

Technical Specifications

Voltage11.1V
Amp Hours4300mAh
Capacity4300mAh
Rate47.73Wh
Net Weight240g /8.47 oz
Gross Weight500g /17.64 oz
Approximate Weight500g /17.64 oz
Dimension 264.95 x 128.00 x 4.05mm

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

HP Spectre x360 BIOS says "consider replacing your battery" on a brand-new cell — is something wrong?

Nothing is wrong with the replacement cell. The Spectre x360 BIOS pulls health data from the old cell's EEPROM and flags it before the fuel gauge IC has any charge history on the new cell. Run two full discharge cycles to hibernate-cutoff, then charge uninterrupted to 100% each time. After the second cycle the BIOS battery learn cycle completes and the warning clears.

Windows is showing a completely different Wh rating for this battery than the spec sheet lists — why?

The Wh value Windows displays comes from the EEPROM embedded in the battery cell, which stores the manufacturer's rated capacity at factory conditions. The product data lists 47.73Wh — if Windows shows a slightly different figure, that is an EEPROM-reported value versus actual chemistry difference and does not affect real-world charge behaviour. No action is needed. After two calibration cycles the OS fuel gauge will track against actual cell output regardless of the EEPROM figure.

New battery on the Spectre x360 won't charge past 80% — is the cell faulty?

This is a BIOS-controlled charge limit, not a cell fault. HP's firmware on some Spectre x360 configurations ships with an 80% charge cap enabled to reduce cell wear over time. Go to HP Support Assistant or UEFI settings and disable the battery care or charge limit option. Once turned off, the cell will charge through to 100% on the next cycle.

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HP Spectre x360 13 Convertible Replacement Battery, 11.1V, 4300mAh, Li-Polymer 1

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