About this replacement
HP X360 310 G2 — 11.4V Li-ion Replacement Battery (HV03XL)
This is an 11.4V, 3950mAh (45.03Wh) Li-ion replacement battery for the HP X360 310 G2 convertible laptop. It slots into the same bay as the original HV03XL and carries the same voltage rail and connector pinout. Also cross-references as HSTNN-LB7B, 818418-421, and 817184-005.
- X360 310 G2 platform fit: HP locked this battery spec to the 310 G2 convertible chassis — the 11.4V three-cell arrangement matches the board's charging IC expectations. Using a lower-voltage cell on this platform causes the controller to report a fault before the cell even finishes seating.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the 310 G2 platform. The BMS handshake completed on first insertion, charge current ramped correctly from CC to CV phase, and the fuel gauge IC accepted the new cell data without stalling at 0%.
- First-cycle calibration on the 310 G2: After installing, run one full discharge down to hibernate-cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the false "poor health" warning that almost always appears after a cell swap on this model.
BIOS reporting battery health as poor after installing the HV03XL replacement
The HP 310 G2 BIOS reads health data from the cell's EEPROM and compares it against the previous battery's learned cycle history. A brand-new cell has a clean EEPROM — the BIOS interprets this as degraded rather than new. Running one full discharge-to-hibernate then a full uninterrupted charge resets the learn cycle. After two to three calibration cycles, the health report normalises. No firmware update is needed.
Laptop shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC hasn't yet mapped the new cell's actual discharge curve. The old curve data causes the OS to misread remaining capacity, and the laptop cuts out before the gauge reaches 0%. It's not a faulty cell — it's a calibration gap. Run two full discharge-to-hibernate cycles followed by uninterrupted full charges. After the second cycle, the gauge should track accurately and the early shutdowns stop. Confirm the cell is holding above 10.5V under load before ruling out a cell fault.