About this replacement
HP EliteBook 1040 G4 — 11.55V Li-Polymer Replacement Battery (BE06XL)
This is an 11.55V, 5700mAh (65.84Wh) Li-Polymer replacement battery for the HP EliteBook 1040 G4 laptop. It replaces OEM part numbers BE06XL, 918045-1C1, 918108-855, HSTNN-DB7Y, and related variants. The battery slots into the 1040 G4 chassis and connects via the original multi-pin BMS connector.
- EliteBook 1040 G4 platform fit: All 1040 G4 variants — including 2XU40UT, 2TM97EA, and 4SB30UT — share the same 11.55V three-cell Li-Polymer configuration, connector pinout, and BMS handshake protocol. One cell covers the full variant range.
- Bench tested on actual hardware: We ran this cell on a 1040 G4 unit under combined CPU load and full display brightness. The BMS held steady through charge and discharge cycles, with no unexpected cutoffs at high draw.
- Post-install calibration on the 1040 G4: After fitting, run the laptop down to hibernate cutoff on battery only, then charge uninterrupted to 100%. 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.
BIOS reporting poor battery health immediately after fitting a new cell
The HP BIOS stores battery health data in EEPROM and compares the new cell's reported charge state against a degraded baseline from the old pack. Until the learn cycle completes, the BIOS treats the new cell as faulty. This is a firmware calibration issue, not a cell defect. Run one full discharge to hibernate threshold followed by an uninterrupted charge to 100% — the health warning typically clears within one to three complete cycles.
Laptop shuts down at 20–30% battery shown on screen
This happens when the fuel gauge IC is still calibrated to the old cell's voltage curve. Under full CPU and display load, actual cell voltage drops faster than the gauge expects, triggering an emergency shutdown before the displayed percentage reaches zero. The gauge needs recalibration cycles against the new cell to map the voltage cliff accurately. Run two to three full discharge-to-hibernate and full-charge cycles — after that, the shutdown threshold and the displayed percentage should align.