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HP ProBook x360 440 G1 Replacement Battery 11.4V 4150mAh

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From $69.99 USD $86.99
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Fits HP ProBook x360 440 G1 and replaces HSTNN-UB7P, RU03XL, HSTNN-IB8P, and eight other OEM part numbers.
11.4V, 4150mAh (47.31Wh) lithium-polymer cell restores full charge cycles on the x360 convertible touchscreen without capacity loss.
Connector slides into the battery slot with positive terminals facing the latch; orientation is keyed, locking tab seats flush against the frame.
We bench-tested this pack against a fresh x360 440 unit — the BMS accepted the new cell on first insertion, charge controller recognized rated capacity immediately.
After installation, 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.
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.

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.

Voltage

11.4V

Amp

4150mAh

HP ProBook x360 440 G1 — 11.4V Li-Polymer Replacement Battery (HSTNN-UB7P)

This 11.4V, 4150mAh (47.31Wh) Li-Polymer battery replaces the original HSTNN-UB7P cell in the HP ProBook x360 440 G1 and related x360 convertible models. It fits the full-rotation hinge platform, including the x360 11 G3 Education Edition and x360 11 G4. Cross-reference OEM part numbers L12717-421, L12717-541, L12791-855, and RU03XL before installing.

  • ProBook x360 platform fit: The 440 G1 and x360 11 Education series share the same 11.4V three-cell Li-Polymer rail, connector pinout, and BMS handshake protocol — that is why one SKU covers all these models without modification.
  • Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS communication cycles on the x360 440 G1 chassis. The protection circuit responded correctly to over-charge and over-discharge thresholds, and the BIOS recognised the cell without error on first boot.
  • Post-install calibration on the x360: After fitting this battery, run one full discharge to hibernate cutoff, 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.

BIOS reporting poor battery health immediately after fitting a new cell

The HP ProBook x360 BIOS stores discharge curve data from the previous cell in its battery learn table. When a new cell is fitted, that stored data no longer matches the actual cell behaviour, so the BIOS flags the battery as degraded. This is not a fault with the replacement — it is a mismatch between old EEPROM data and a fresh chemistry profile. Running one complete discharge-to-hibernate followed by a full uninterrupted charge gives the BIOS enough data to rebuild an accurate learn table. After two or three cycles, the health warning clears and the reported capacity stabilises.

Laptop shuts down at 20–30% charge shown on screen

When the CPU and display both draw maximum load simultaneously on the x360 440 G1, the battery must sustain voltage above the BMS cutoff threshold continuously. If the fuel gauge IC is still calibrating against the new cell, the percentage shown on screen can lag well behind the real state of charge — so the machine cuts out at what looks like 25% but is actually near-empty. This is a calibration gap, not a failing cell. Run the discharge-recharge cycle described above to synchronise the fuel gauge IC with the new cell's actual voltage curve. After calibration, shutdowns should not occur until the display reads below 5%.

Compatible Models

ProBook x360 440 G1 ProBook x360 11 G3 Education Edition ProBook x360 440 G1(4QW71EA) PROBOOK X360 11 G4 ProBook x360 440 G1(4QX79ES) ProBook x360 440 G1(4QW73EA) ProBook x360 440 G1(4LS88EA) ProBook x360 440 G1(5JJ77ES) ProBook x360 440 G1(4QX70EA) ProBook x360 440 G1(4LS92EA) PROBOOK X360 440 G1(4TK04PA) ProBook x360 440 G1(4QX73EA) ProBook x360 440 G1(4QW49ES) ProBook x360 11 G3 Education ProBook x360 440 G1(4QX78ES) ProBook x360 440 G1(4QW72EA) ProBook x360 440 G1(4WV03ES) ProBook x360 440 G1(4QW74EA) ProBook x360 440 G1(4LS91EA) ProBook x360 440 G1(5JJ78ES) ProBook x360 440 G1(4QX72EA) ProBook x360 440 G1(4QW42EA) ProBook x360 440 G1(4QX77ES) ProBook x360 11 G3

Replaces Part Numbers

HSTNN-UB7P L12717-421 L12717-541 L12791-855 RU03XL HSTNN-IB8P HSTNN-LB8K L12717-171 L12717-1C1 RU03048XL

Technical Specifications

Voltage11.4V
Amp Hours4150mAh
Capacity4150mAh
Rate47.31Wh
Net Weight202g /7.13 oz
Gross Weight342g /12.06 oz
Approximate Weight342g /12.06 oz
Dimension 190.90 x 101.30 x 6.60mm

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 system information panel shows the wrong Wh rating after I installed the new battery — it says something different from what the original showed. Is the cell wrong?

The Wh value displayed in Windows or HP Support Assistant is read from the cell's EEPROM, and the rated figure stored there can differ slightly from what the fuel gauge IC measures against the actual chemistry. This is a data reporting difference, not a capacity fault. The physical cell in this SKU is rated at 47.31Wh. If the displayed figure is within a few Wh of that, the cell is correct — run a full discharge-to-hibernate cycle and the fuel gauge will recalculate against real measured data.

My ProBook x360 stops charging at 80% and never goes higher — is the battery defective?

HP's BIOS includes a Battery Care Mode that caps charging at 80% to reduce cell stress during long periods on AC power. Check HP Support Assistant or the BIOS under Power settings — if Battery Care Mode or Optimised Battery Charging is enabled, that is the cause, not the cell. Disable that setting and the battery will charge to 100%. We confirmed this behaviour on the bench: the cell itself accepts a full charge once the firmware cap is lifted.

The battery percentage jumps around wildly for the first few days — it reads 60%, then drops to 10% within minutes, then jumps back up.

The fuel gauge IC inside the ProBook x360 uses stored discharge curve data to estimate state of charge. After a cell swap, that stored curve no longer matches the new cell's actual voltage profile, so readings are erratic until the IC recalibrates. This typically settles within two to four full discharge-and-recharge cycles. To speed it up, discharge the laptop to hibernate cutoff, then charge uninterrupted to 100% twice in a row — by the end of the second cycle, the fuel gauge IC will have enough data to track the new cell accurately.

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