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HP Pavilion X360 15-BK150SA WA03XL Replacement Battery 11.1V

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From $69.99 USD $86.99
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Fits HP Pavilion X360 15-BK150SA and replaces WA03XL, HSTNN-LB7T, 916367-421 battery pack.
11.1V at 3950mAh delivers 43.85Wh — sustains the hybrid touchscreen and CPU load without mid-cycle voltage sag.
Connector slides into the slot beneath the keyboard; tab locks flush against the chassis frame.
Bench testing showed the BMS accepted full charge on first cycle with no fault delays or cutoff anomalies.
After installation, discharge fully to system hibernation then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears health warnings that appear after cell swaps.
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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

11.1V

Amp

3950mAh

HP Pavilion X360 15-BK150SA — 11.1V Li-ion Replacement Battery (WA03XL)

This is a 11.1V, 3950mAh (43.85Wh) Li-ion replacement battery for the HP Pavilion X360 15-BK150SA convertible notebook. It also fits a wide range of Pavilion X360 15 variants, including the 15-bk102ng and 15-br041nr. It replaces OEM part numbers WA03XL, HSTNN-LB7T, and 916367-421, among others.

  • Pavilion X360 15 compatibility: These 15-BK and 15-BR models share the same three-cell Li-ion pack configuration, voltage rail, and connector pinout. The BMS handshake protocol and EEPROM data structure are consistent across this generation, so one cell fits all of them without modification.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the X360 platform and monitored BMS communication. The protection circuit responded correctly to charge cutoff at full capacity and to low-voltage cutoff under load — no rogue trip events recorded.
  • Post-install calibration on the X360: After fitting this battery, run the laptop down to hibernate-cutoff under normal use — do not force it. Then charge uninterrupted to 100% without using the machine. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

Laptop shutting down at 20–30% shown on the Pavilion X360

This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. The new cell's voltage curve does not match what the IC expects, so the system sees a steep voltage cliff and triggers an emergency shutdown well before the actual charge is gone. The fix is a full discharge-to-hibernate cycle followed by a full uninterrupted charge — repeated two to three times. After those calibration passes, the reported percentage will track the actual cell state correctly.

BIOS reporting wrong Wh rating after battery swap

The HP BIOS reads Wh rating from the cell's EEPROM, not from live measurement. If the EEPROM in the replacement cell carries a different factory-programmed rated capacity than the original, the system info screen will show a figure that does not match the label on the battery. This is an EEPROM data difference, not a fault. Actual charge capacity is determined by the cell chemistry — 43.85Wh in this case. To confirm, check the battery report in Windows: run powercfg /batteryreport in an elevated command prompt and compare the Design Capacity to the Full Charge Capacity after two calibration cycles.

Compatible Models

Pavilion X360 15-BK150SA Z9D30EA Pavilion x360 15-bk102ng Pavilion x360 - 15-br041nr Pavilion x360 15-bk001tx Pavilion x360 15-bk010nr Pavilion x360 15-bk005ne Pavilion x360 15-bk020wm Pavilion x360 15 br010nr Pavilion x360 15-bk193m Pavilion X360 15-bk002tx Z1D85PA Pavilion x360 14-ba016na Pavilion x360 15-br003na Pavilion X360 15-BK011 Pavilion X360 15BR005NW Pavilion X360 15BR010NO Pavilion x360 15-br014ng Pavilion X360 15BR014UR Pavilion X360 15-BR001NV Pavilion X360 15br071ng Pavilion X360 15-BR005NH Pavilion X360 15-BR010NO Pavilion X360 15-BR016NA Pavilion X360 15-BR097NIA Pavilion X360 15-BR115TX Pavilion X360 15BR009NC Pavilion X360 15BR012NO Pavilion X360 15-BR000NO Pavilion X360 15BR019NA Pavilion X360 15-BR003NO Pavilion X360 15-BR008NM Pavilion X360 15-BR012UR Pavilion X360 15-BR023NA Pavilion X360 15-BR100UR Pavilion X360 15BR002NE Pavilion X360 15BR006NA Pavilion X360 15BR010UR Pavilion x360 15-br016ng Pavilion X360 15BR015NB Pavilion X360 15br100ng Pavilion X360 15-BR005NW Pavilion X360 15-BR010UR Pavilion X360 15-BR017NG Pavilion X360 15-BR098NZ Pavilion X360 15-BR158CL Pavilion X360 15br001ng Pavilion X360 15BR004NO Pavilion X360 15BR009NO Pavilion x360 15-br001ng Pavilion X360 15BR013NA Pavilion X360 15BR019TX Pavilion X360 15-BR009NC Pavilion X360 15-BR013NB Pavilion X360 15-BR031NG Pavilion X360 15-BR101NE Pavilion X360 15BR002NV Pavilion X360 15BR006NO Pavilion X360 15BR011NO Pavilion x360 15-br030ng Pavilion X360 15BR016NA Pavilion X360 15-BR002NE Pavilion X360 15-BR003NK Pavilion X360 15-BR006NA Pavilion X360 15-BR011NO Pavilion X360 15-BR019NA Pavilion X360 15-BR099NP Pavilion X360 15BR001NK Pavilion X360 15BR004TX Pavilion X360 15BR010CA Pavilion x360 15-br010ng Pavilion X360 15br013ng Pavilion X360 15-BR001NE Pavilion X360 15BR021TX Pavilion X360 15-BR004NO Pavilion X360 15-BR009UR Pavilion X360 15-BR014UR Pavilion X360 15-BR032NG Pavilion X360 15-BR101NM Pavilion X360 15BR000NO Pavilion X360 15BR003NA Pavilion X360 15BR008NH Pavilion X360 15BR011UR Pavilion x360 15-br071ng Pavilion X360 15BR017NA Pavilion X360 15-BR002NV Pavilion X360 15-BR006NO Pavilion X360 15-BR011UR Pavilion X360 15-BR020CA Pavilion X360 15-BR100NI Pavilion X360 15BR001TX Pavilion X360 15BR005NM Pavilion X360 15br010ng Pavilion x360 15-br013ng Pavilion X360 15br014ng Pavilion X360 15-BR001NK Pavilion X360 15br070ng Pavilion X360 15-BR004TX Pavilion X360 15-BR010ND Pavilion X360 15-BR015NB Pavilion X360 15-BR035TX Pavilion X360 15-BR096NIA Pavilion X360 15-BR102TX Pavilion X360 15BR003NT Pavilion X360 15BR008UR Pavilion X360 15br012ng Pavilion x360 15-br100ng Pavilion X360 15BR018NA Pavilion X360 15-BR008NH Pavilion X360 15-BR012NO Pavilion X360 15-BR022TX Pavilion X360 15-BR100NZ Pavilion X360 15BR005TX Pavilion x360 15-br015ng Pavilion X360 15BR015NA Pavilion X360 15-BR001TX Pavilion X360 15br100 Pavilion X360 15-BR005NM Pavilion X360 15-BR017NA Pavilion X360 15-BR040NZ Pavilion X360 15-BR098NP Pavilion X360 15-BR124TX Pavilion X360 15BR001NE Pavilion X360 15BR004NM Pavilion X360 15br009ng Pavilion X360 15BR012UR Pavilion X360 15-BR000UR Pavilion X360 15br019ng Pavilion X360 15-BR003NT Pavilion X360 15-BR008UR Pavilion X360 15-BR013NA Pavilion X360 15-BR029TX Pavilion X360 15-BR101NB Pavilion X360 15BR002NK Pavilion X360 15BR006NM Pavilion X360 15BR011NB Pavilion x360 15-br019ng Pavilion X360 15br015ng Pavilion X360 15-BR160CL Pavilion X360 15-BR005TX Pavilion X360 15-BR011NB Pavilion X360 15-BR018NA Pavilion X360 15-BR099NIA Pavilion X360 15m-bq121dx Pavilion X360 15BR001NIA Pavilion X360 15BR004NW Pavilion X360 15BR009UR Pavilion x360 15-br009ng Pavilion X360 15BR013NB Pavilion X360 15BR020CA Pavilion X360 15-BR004NM Pavilion X360 15-BR009NO Pavilion X360 15-BR014NA Pavilion X360 15-BR031TX Pavilion X360 15-BR101NG Pavilion X360 15BR007TX Pavilion X360 15BR011TX Pavilion x360 15-br070ng Pavilion X360 15br016ng Pavilion X360 15-BR002NK Pavilion X360 15-BR006NM Pavilion X360 15-BR011TX Pavilion X360 15-BR019TX Pavilion X360 15-BR100NB Pavilion X360 15BR001NV Pavilion X360 15BR005NH Pavilion X360 15BR010ND Pavilion x360 15-br012ng Pavilion X360 15BR014NA Pavilion X360 15-BR001NIA Pavilion X360 15br030ng Pavilion X360 15-BR004NW Pavilion X360 15-BR010CA Pavilion X360 15-BR015NA Pavilion X360 15-BR102NG Pavilion X360 15BR000UR Pavilion X360 15BR003NO Pavilion X360 15BR008NM Pavilion X360 15BR012NB Pavilion x360 15-br100 Pavilion X360 15BR017NG Pavilion X360 15-BR007TX Pavilion X360 15-BR012NB Pavilion X360 15-BR021TX Pavilion X360 15-BR100NV

Replaces Part Numbers

WA03XL HSTNN-LB7T 916367-421 916812-855 TPN-W126 WAO3XL 916812-055 916367-541

Technical Specifications

Voltage11.1V
Amp Hours3950mAh
Capacity3950mAh
Rate43.85Wh
Net Weight216.3g /7.63 oz
Gross Weight356.3g /12.57 oz
Approximate Weight356.3g /12.57 oz
Dimension 200.55 x 105.50 x 6.76mm

Product Highlights

  • Brand: HP
  • 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 HP Pavilion X360 shows "Consider replacing your battery" immediately after fitting a new cell — is something wrong with it?

Nothing is wrong with the cell. The HP BIOS carries over health data from the old battery's EEPROM and flags a warning until it completes a fresh learn cycle. Run the laptop down to hibernate-cutoff under normal workload, then charge it uninterrupted to 100%. After one to two full cycles, the warning clears as the BIOS recalibrates against the new cell's actual voltage curve.

The fuel gauge is jumping around — 67%, then 43%, then back to 55% — on the first day with the new battery. What's causing it?

The fuel gauge IC inside the X360 builds its charge model against the old cell's discharge curve. With a new cell installed, those reference points no longer match, so the percentage reading is unstable for the first few cycles. We saw the same behaviour on the bench — it settled after three full discharge-to-hibernate and charge-to-100% passes. Run those cycles without leaving the laptop on standby mid-discharge, and the gauge will stabilise.

New battery charges but stops at 80% and won't go higher — is this a faulty cell?

This is almost always HP's battery charge limit feature in the BIOS, not a cell fault. HP firmware on the X360 line includes an adaptive charging mode that caps charge at 80% to reduce cell stress during extended AC use. Open the HP Support Assistant app, navigate to Battery settings, and disable the charge limit — or go into the BIOS setup (F10 at boot) and check for an Adaptive Battery Optimizer option. Once disabled, a full charge cycle should reach 100%.

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