About this replacement
HP EliteBook X360 1020 G2 — 7.7V Li-Polymer Replacement Battery (ET04XL)
This is a 7.7V, 6300mAh (48.51Wh) lithium-polymer battery for the HP EliteBook X360 1020 G2 convertible laptop. It replaces OEM part ET04XL and cross-references 915030-171, 915191-855, HSTNN-IB7U, and related part numbers. Confirmed fit covers the 1eq23ea, 1ep69ea, 2tn00es, 4wq57pa, and 30+ additional G2 variants.
- EliteBook X360 1020 G2 platform fit: All G2 variants on this list share the same 7.7V battery rail, ET04XL connector pinout, and BMS handshake protocol — which is why one part number covers the full model range.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the X360 1020 G2 platform. The BMS negotiated correctly, charge termination triggered at rated capacity, and no fault codes appeared in HP Support Assistant.
- Post-install calibration on the X360 1020 G2: After fitting this battery, run the laptop down to hibernate cutoff under normal use, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that commonly appears after a cell swap on this platform.
BIOS reporting poor battery health immediately after replacement
The HP BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell during the first boot. Because the new cell has no usage history logged, the BIOS flags it as degraded or unknown. This is a firmware calibration gap, not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — the BIOS battery learn cycle will update its data and the health warning will clear.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The percentage shown is still mapped to the old cell's behaviour, so the system hits a voltage cliff and cuts power before the gauge reaches zero. It is not a defective cell. Run two or three full discharge-to-hibernate cycles and the fuel gauge IC will recalibrate — after which the displayed percentage and actual cutoff will align. Check that actual cell voltage at shutdown is not dropping below 6.0V, which would indicate a separate issue.