About this replacement
HP Envy X2 15 — 11.4V Li-Polymer Replacement Battery (SM03XL)
This is an 11.4V, 4300mAh (49.02Wh) Li-Polymer replacement battery for the HP Envy X2 15 series 2-in-1. It fits the detachable display unit — the tablet portion of the device — not the keyboard base. Compatible across Envy X2 15-C000 and 15-C001 variants, cross-referencing OEM part numbers SM03XL, 767069-005, and HSTNN-IB6O among others.
- Envy X2 15 display unit fit: The Envy X2 15 series shares a single battery platform across its C000 and C001 submodels. Same connector pinout, same BMS handshake protocol, same 11.4V rail feeding the detachable display. One cell fits the full run of this series.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Envy X2 15 platform. The BMS negotiated correctly with the host device, charge termination triggered at the expected voltage ceiling, and no protection trip occurred during display-load draw.
- Post-install calibration on the Envy X2 15: After fitting this cell, run a full discharge until the device hibernates, then charge uninterrupted to 100% without interruption. 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 Envy X2 15 BIOS reads health data from EEPROM embedded in the battery pack. When a new cell goes in, that EEPROM carries different cycle count and capacity data than the firmware expects, so the BIOS flags it as degraded — even though the cell is brand new. This is a firmware calibration issue, not a fault with the replacement. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite its battery learn table against the new cell. After one or two cycles, the health indicator normalises.
Envy X2 15 shutting 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 voltage curve. The OS reads the old curve, reports 25% remaining, but the cell voltage has already dropped below the BMS cutoff threshold under combined CPU and display load — so the device shuts off. The fuel gauge needs two to three full discharge and charge cycles to map the new cell accurately. After calibration, the reported percentage at shutdown will align with the actual cutoff voltage of approximately 9.0V under load.