BL04XL HP EliteBook x360 1040 G5 Replacement Battery 7.7V 7200mAh
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BL04XL HP EliteBook x360 1040 G5 Replacement Battery 7.7V 7200mAh - 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.
Disclaimer
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.
BL04XL HP EliteBook x360 1040 G5 Replacement Battery 7.7V 7200mAh - is backordered and will ship as soon as it is back in stock.
Voltage
7.7V
Amp
7200mAh
HP EliteBook x360 1040 G5 — 7.7V Li-Polymer Replacement Battery (BL04XL)
This 7.7V, 7200mAh (55.44Wh) Li-Polymer cell replaces the OEM BL04XL battery in the HP EliteBook x360 1040 G5 convertible notebook. It fits the full G5 production run, including units shipped as 5NW10UT, 5DG02EA, 5DF79EA, and 3SH44AV, among 47 additional configurations. The connector, BMS pinout, and EEPROM handshake match the factory specification.
- G5 platform compatibility: Every EliteBook x360 1040 G5 variant runs the same internal voltage rail and uses an identical four-cell Li-Polymer pack with the same BL04XL BMS handshake. One SKU covers the entire G5 run — there is no electrical difference between the sub-models listed.
- Bench tested on actual hardware: We cycled this cell on a G5 unit and confirmed the BMS completed a full charge handshake with the EC firmware. Charge current stepped correctly from bulk to taper, and the BIOS reported Wh capacity within expected tolerance of the rated 55.44Wh.
- Post-installation calibration on the G5: After fitting, run one full discharge down to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle. Without it, the fuel gauge IC has no reference data for the new cell and will report inaccurate state-of-charge readings for the first several sessions.
BIOS reporting poor battery health immediately after G5 cell swap
The EliteBook x360 1040 G5 reads battery health from EEPROM data written to the pack during factory conditioning. When a replacement cell arrives, that EEPROM data does not match the charge history the BIOS expects from a "healthy" pack. The system flags the new cell as degraded before it has ever completed a cycle. Running the battery learn cycle — full discharge to hibernate, then uninterrupted charge to 100% — writes fresh reference data and clears the warning. After one complete cycle, the BIOS health indicator should return to normal.
Laptop shuts down at 20–30% remaining after battery swap
This is a voltage cliff, not a faulty cell. The fuel gauge IC on the G5 is still using calibration data from the old, degraded pack. It reports 20–30% remaining at a voltage point where the new cell actually has enough capacity left. Under full CPU and display load, voltage sags briefly below the EC cutoff threshold, and the system shuts down. Complete two full calibration cycles — discharge fully to hibernate, charge to 100% each time — so the fuel gauge IC maps the new cell's actual voltage curve. After calibration, the reported percentage and the real cutoff point will align.
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
The HP BIOS shows the wrong Wh rating after I installed the new BL04XL — it reads lower than 55.44Wh. Is the cell faulty?
Not necessarily. The Wh figure the BIOS displays is read from the EEPROM on the pack, and a replacement cell's EEPROM may carry a rated value that differs slightly from the chemistry-actual capacity. Run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. After the learn cycle completes, the BIOS recalculates from live coulomb-counting data rather than the static EEPROM value, and the reported Wh should move closer to the 55.44Wh rated figure.
The EliteBook x360 1040 G5 stops charging at 80% and won't go higher — is this a defective cell?
Almost always no. The G5 BIOS includes a Battery Health Manager setting that caps charge at 80% to reduce cell stress during extended AC use. Check BIOS Setup (F10 at boot) under Power → Battery Health Manager and switch the mode from "Maximize Battery Health" to "Let HP manage my battery." Once the cap is lifted, plug in and the cell will charge through to 100%.
After fitting the replacement battery, the fuel gauge on my G5 jumps around wildly — showing 60%, then 45%, then 70% within minutes.
The fuel gauge IC lost its reference map when the old cell was removed. It is now interpolating state-of-charge against a voltage curve it does not recognise. The fix is calibration: run the laptop on battery until it hibernates from low power, then charge it uninterrupted to 100% without unplugging mid-cycle. Repeat this once more. After two complete cycles the IC has enough data to track the new cell's voltage curve accurately and the gauge will stabilise.
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