SR03XL HP Pavilion 15-CX Replacement Battery 11.55V 4000mAh
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SR03XL HP Pavilion 15-CX Replacement Battery 11.55V 4000mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
SR03XL HP Pavilion 15-CX Replacement Battery 11.55V 4000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.55V
Amp
4000mAh
HP Pavilion 15-CX Series — 11.55V Li-Polymer Replacement Battery (SR03XL)
This is an 11.55V, 4000mAh (46.2Wh) lithium-polymer replacement battery for the HP Pavilion 15-CX series, including the 15-CX0058WM, 15-CX0071TX, and 15-CX0061TX. It replaces OEM part numbers SR03XL, HSTNN-IB8L, L08934-1B1, and L08855-855. Swap it in when the original cell no longer holds a charge or fails to register with the OS.
- Pavilion 15-CX series fit: The CX line uses a shared battery bay geometry, connector pinout, and BMS handshake across its variants. The SR03XL communicates cell data to HP's EC firmware over the SMBus interface — the same protocol used across the full CX platform, which is why one part number covers this many models.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Pavilion 15-CX unit. The BMS negotiated correctly with the EC firmware, the fuel gauge IC initialised without error codes, and the charge controller reached full termination voltage at 12.6V without interruption.
- Post-install calibration on the CX platform: After fitting, run the laptop down to hibernate-cutoff under normal load, then charge uninterrupted to 100%. This forces the fuel gauge IC to recalibrate against the new cell and clears the inaccurate battery health warning the HP BIOS posts after every cell swap.
BIOS reporting poor battery health immediately after fitting the SR03XL
HP's EC firmware reads EEPROM data stored on the old cell and caches it. When a new cell is installed, that cached data conflicts with the fresh cell's reported state, triggering a false "poor health" or "consider replacing" warning in BIOS and Windows Battery Report. This is not a fault with the replacement cell — it is a calibration state. Run one full discharge to hibernate-cutoff, then a full uninterrupted charge to 100%. After two to three cycles, the fuel gauge IC rewrites its learned parameters and the BIOS warning clears.
Laptop shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet mapped the new cell's voltage curve. Under combined CPU and display load, the cell voltage drops faster than the uncalibrated gauge predicts, and the EC triggers a hard shutdown before the displayed percentage reaches zero. The gauge is reading a learned curve from the old cell, not the actual new one. Run two full discharge-to-hibernate and full-charge cycles — after that, the IC recalculates the voltage cliff point for the SR03XL chemistry and the shutdowns stop. Confirm the fix by watching cell voltage hold above 10.8V at the 20% mark under load.
Compatible Models
Replaces Part Numbers
Technical Specifications
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 BIOS says the battery health is poor right after I installed the new SR03XL — is the replacement cell faulty?
It is not a faulty cell. HP's embedded controller caches EEPROM data from the original battery, and when a new cell is fitted, the mismatch triggers a false health warning in both BIOS and Windows Battery Report. Run one full discharge to hibernate-cutoff under normal use, then charge uninterrupted to 100%. After two to three full cycles the fuel gauge IC rewrites its learned parameters and the warning clears.
Windows is showing a completely wrong Wh rating for the SR03XL — it says something other than 46.2Wh in the battery report.
Windows reads the Wh figure from the cell's EEPROM register, which stores the design capacity as shipped by the OEM. On a replacement cell, that register may reflect the rated chemistry value rather than the exact tested capacity, so the number displayed can differ slightly from the 46.2Wh spec in the product data. This is a data-register difference, not a capacity fault. Run a full discharge-to-hibernate cycle followed by a full charge and check whether Windows Battery Report updates the value — after the first calibration cycle it typically resolves.
The Pavilion 15-CX fuel gauge is wildly inaccurate for the first few charge cycles after swapping in the new battery — jumping from 60% to 15% with no warning.
The fuel gauge IC on the CX platform uses a learned voltage-curve model tied to the previous cell's chemistry data. After a cell swap, that model no longer matches the new cell, so percentage readings jump erratically under load. The IC needs two to three full discharge-to-hibernate and uninterrupted full-charge cycles to build an accurate curve against the SR03XL. After those cycles, percentage readings stabilise — confirm accuracy by checking that the gauge tracks smoothly below 30% without sudden drops under full CPU and display load.
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