NU03XL HP Pavilion X360 11-U Compatible Battery 11.55V 3600mAh
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NU03XL HP Pavilion X360 11-U Compatible Battery 11.55V 3600mAh - 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
⚠️ 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.
NU03XL HP Pavilion X360 11-U Compatible Battery 11.55V 3600mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.55V
Amp
3600mAh
HP Pavilion X360 11-U000 Series — 11.55V Li-ion Replacement Battery (NU03XL)
This is an 11.55V, 3600mAh (41.58Wh) Li-ion battery for the HP Pavilion X360 11-U000 series convertible laptop. It replaces OEM part numbers NU03XL, HSTNN-UB6V, and TPN-W117, among others. It fits the 11-U000, 11-U000ng, 11-U001ng, 11-U002ng, and over 200 additional X360 11-U variants.
- X360 11-U series compatibility: All 11-U models share the same 11.55V three-cell architecture, connector pinout, and BMS handshake protocol. The TPN-C128 and TPN-W117 designations both map to the same internal cell configuration, so one battery covers the full lineup.
- Bench tested on actual hardware: We ran this cell on an 11-U unit and confirmed the BMS negotiated correctly with the EC controller. The charge circuit accepted the full 3600mAh draw without triggering a fault code, and the fuel gauge IC responded to the new cell data as expected.
- Post-install discharge cycle on the X360: After fitting this battery, run the laptop on battery power until it hibernates at low charge, then charge uninterrupted to 100% without interruption. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after fitting a new cell
The HP BIOS reads health data stored in the battery's EEPROM, not from live cell measurements alone. When you swap cells, the EEPROM values from the old pack can persist in the system's embedded controller memory, causing the BIOS to flag the new battery as degraded. This is not a fault with the replacement cell. Running one complete discharge-to-hibernate followed by an uninterrupted charge to 100% triggers the learn cycle and rewrites the EC's stored capacity baseline. After that cycle, the BIOS health indicator should return to normal.
Pavilion X360 shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC's stored discharge curve no longer matches the actual cell. Under full load — CPU boost plus touchscreen display — voltage drops faster than the gauge predicts, and the system hits the hardware cutoff threshold before the percentage reaches zero. The gauge was calibrated to the old cell's curve and hasn't updated yet. Run two or three full discharge-to-hibernate and full-charge cycles to give the fuel gauge IC enough data to recalibrate against the new cell. After calibration, the shutdown percentage should track accurately down to the configured low-battery cutoff, typically around 5%.
Compatible Models
Replaces Part Numbers
Technical Specifications
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
HP BIOS shows my new battery as "unknown" or 0% — is the cell dead?
No. The HP embedded controller cached the old cell's EEPROM data and hasn't accepted the new cell's identity yet. Power the laptop fully off, leave it unplugged for 60 seconds, then boot and allow a full charge to 100% without interruption. That sequence prompts the EC to re-read the battery EEPROM and register the replacement cell correctly.
System info shows the wrong Wh rating after I installed this battery — it lists a different number than 41.58Wh.
The Wh figure shown in Windows or HP Support Assistant pulls from the battery's EEPROM rated value, which can differ slightly from the actual chemistry spec depending on firmware revision on the cell. The cell capacity is 3600mAh at 11.55V, which works out to 41.58Wh. If the displayed figure is close to that and the laptop charges normally, the battery is functioning correctly — the EEPROM label is cosmetic, not a fault.
Charge stops at 80% and won't go higher — is this a faulty cell?
Almost certainly not. The HP Pavilion X360 BIOS includes a firmware-controlled charge limit that caps charging at 80% when "Battery Care" mode is enabled in HP Support Assistant or UEFI settings. Open HP Support Assistant, go to the battery settings tile, and disable Battery Care or set the charge limit to 100%. Once that setting is off, the cell will charge to its full 11.55V terminal voltage.
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