HP ProBook 635 AERO G7 Replacement Battery GR03042XL 11.55V

HP ProBook 635 AERO G7 — 11.55V Li-Polymer Replacement Battery (GR03042XL)

This 11.55V, 3450mAh (39.85Wh) Li-Polymer cell replaces the factory GR03042XL battery in the HP ProBook 635 AERO G7. It fits the full ProBook 635 AERO G7 lineup, including the 2N2T0UT, 2N2T4UT, and 2W0R2PA variants. The OEM part numbers GR03XL, M12328-2C1, M12328-2D1, and TPN-DB0D all cross-reference to this same cell.

• ProBook 635 AERO G7 platform fit: Every listed variant shares the same 11.55V three-cell architecture and connector pinout. The BMS handshake protocol is consistent across the G7 chassis, so this cell communicates correctly with the EC firmware without any adapter or modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a ProBook 635 AERO G7 unit. The BMS negotiated correctly at startup, accepted a full charge without tripping overcurrent protection, and held voltage within spec under sustained CPU and display load.
• First-cycle calibration on the ProBook 635: After fitting this cell, run it down to hibernate-cutoff under normal use, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false "poor health" or "0% capacity" warning that the HP EC firmware commonly throws after any cell swap.

BIOS reporting poor battery health immediately after fitting a new cell

HP's embedded controller reads EEPROM data written by the original cell during its first learn cycle. A brand-new cell has no EEPROM history, so the EC flags it as degraded or unknown — this is a firmware read failure, not a cell fault. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% writes fresh EEPROM data that the EC accepts. After two to three cycles, the BIOS health indicator will update to reflect the actual cell state. No BIOS update or setting change is needed.

Laptop shuts down at 20–30% remaining after the battery swap

This happens when the fuel gauge IC still holds the voltage-to-capacity curve from the old, degraded cell. Under combined CPU and display load, voltage drops faster than the old curve predicts, and the EC triggers an emergency shutdown before the displayed percentage reaches zero. The fix is a calibration cycle: let the laptop discharge fully to hibernate under active use — not idle — then charge to 100% without interruption. After two full calibration cycles, the fuel gauge IC maps the new cell's voltage cliff correctly and the premature shutdown stops. Target charge voltage to confirm full completion is 12.6V at the cell terminals.