About this replacement
HP Elite x360 1040 G11 — 11.55V Li-Polymer Replacement Battery (ER06068XL)
This 11.55V, 5600mAh (64.68Wh) Li-Polymer battery is a direct cell replacement for the HP Elite x360 1040 G11, EliteBook 1040 G11, and EliteBook x360 1040 G11. It fits the internal battery bay and connects via the original flex cable and BMS harness. OEM part numbers covered include ER06068XL, ER06XL, HSTNN-OB3I, N59734-271, and TPN-DB1T.
- G11 platform fit: The Elite x360 1040 G11 and EliteBook 1040 G11 share the same battery bay dimensions, BMS handshake protocol, and 11.55V nominal voltage rail — one cell fits all three listed models without modification.
- Bench tested on actual hardware: We cycled this cell on a G11 chassis and confirmed the BMS handshake completes on first boot. The EEPROM initialises correctly and the HP battery manager reads full capacity without a manual learn cycle trigger.
- First cycle after install: After fitting this cell, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after a cell swap on G11 hardware.
BIOS reporting poor battery health immediately after fitting a new cell
The HP BIOS reads health status from EEPROM data stored on the battery's BMS board. A new cell ships with fresh EEPROM values that don't yet match the laptop's learned charge history, so the BIOS flags it as degraded. This is a calibration state, not a fault. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — the BIOS learn cycle resets and the health warning clears.
Laptop shuts down at 20–30% shown on the fuel gauge
This happens when the fuel gauge IC hasn't calibrated against the new cell's actual voltage curve. Under combined CPU and display load, the cell voltage drops faster than the uncalibrated gauge predicts, and the system hits the low-voltage cutoff before the percentage reaches zero. The gauge reads a false floor. Complete two full discharge-to-hibernate cycles charging back to 100% each time — after cycle two, the fuel gauge IC maps the new cell's curve accurately and the shutdowns stop. Confirm calibration is complete when the gauge reads below 10% without a forced shutdown.