HP Omen 15 RR04 Replacement Battery 15.2V 3700mAh

HP Omen 15 Series — 15.2V Li-ion Replacement Battery (RR04)

This is a 15.2V, 3700mAh (56.24Wh) Li-ion replacement battery for HP Omen 15 laptops using OEM part number RR04. It fits the Omen 15, Omen 15-5014TX, and TPN-W111 platforms. Voltage, connector type, and BMS handshake match the original HP specification.

• Omen 15 / TPN-W111 platform fit: These models share the same 15.2V four-cell architecture, connector pinout, and BMS communication protocol — one cell works across all three variants without any adapter or modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a TPN-W111 board. The BMS accepted the cell without fault codes, charge current stepped correctly through CC and CV phases, and the protection circuit tripped cleanly at the low-voltage cutoff threshold.
• Post-swap BIOS calibration: After fitting this cell, run the laptop down to hibernate cutoff under normal use — do not force-drain — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Omen hardware.

Why the Omen 15 shuts down at 20–30% after a battery swap

The Omen 15 BIOS uses a stored discharge curve from the previous cell to calculate remaining capacity. A new cell has a different voltage-to-capacity profile at the low end, so the BIOS hits its cutoff trigger earlier than the fuel gauge expects. Under full GPU and CPU load, the voltage cliff on a fresh cell is steeper than on a worn one, which worsens the gap. Running two complete discharge-to-hibernate and full-recharge cycles lets the fuel gauge IC map the new cell's actual curve. After calibration, shutdown behaviour at the low end normalises.

BIOS reports battery health as "Unknown" or 0% immediately after installation

This happens because the BIOS reads health data from EEPROM stored in the old cell — the new cell starts with no accumulated cycle data, so Windows and the HP Battery Check utility return an unknown or zero-health flag. It is not a fault with the replacement cell. Boot into the BIOS, navigate to the battery settings, and run the battery learn or calibration cycle if the option is present. If no BIOS option exists, two full discharge-recharge cycles through the OS will populate the EEPROM fields and clear the warning.