About this replacement
HP Chromebook X2 — 7.7V Li-Polymer Replacement Battery (CH04XL)
This is a 7.7V, 6200mAh (47.74Wh) Li-Polymer replacement battery for the HP Chromebook X2 2-in-1 convertible. It fits the 12-F000NA, 12-F014DX, 12-F004NF, and related X2 12 series tablets. OEM part numbers include CH04XL, 941190-1C1, 941617-855, and HSTNN-IB8E.
- Chromebook X2 12-series fit: These models share the same detachable tablet chassis, connector pinout, and BMS handshake protocol. Any X2 12-F variant running the same board revision accepts this cell without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Chromebook X2 12-F014DX. The BMS negotiated correctly, charge termination triggered at 100%, and the protection circuit tripped normally at low-voltage cutoff.
- First cycle after installation: Run the tablet down to auto-shutdown — not just sleep — then charge uninterrupted to 100%. This forces ChromeOS to complete a battery learn cycle and clears the false "poor health" or "unknown battery" warning that appears after every cell swap on this platform.
Why ChromeOS reports poor battery health after fitting a new cell
The Chromebook X2 stores battery health data in EEPROM on the BMS. When a new cell goes in, that EEPROM data reflects the old cell's wear history, not the new one. ChromeOS reads that stored value and flags the battery as degraded even though the cell is fresh. One complete learn cycle — full discharge to hibernate cutoff, then a full uninterrupted charge — rewrites the EEPROM baseline and clears the warning. After two or three cycles, the fuel gauge IC recalibrates to the new cell's actual capacity.
Chromebook X2 shutting down at 20–30% remaining after battery swap
This happens because the fuel gauge IC is still mapped to the old cell's voltage-to-capacity curve. Under combined CPU and display load, the new cell's voltage drops faster than the uncalibrated gauge expects, and the system hits its hardware undervoltage cutoff before the displayed percentage reaches zero. It is not a fault with the replacement cell. Run two full discharge-to-shutdown and full recharge cycles — each time letting the device reach forced shutdown, not sleep — and the gauge will remap to the correct voltage curve, typically stabilising the shutdown point below 5%.