Clevo P955EP6 Replacement Battery 15.2V 3500mAh 4ICP5/65/80

Clevo P955EP6 / P950 Series — 15.2V Li-Polymer Replacement Battery (P950BAT-4)

This is a 15.2V, 3500mAh (53.2Wh) Li-Polymer battery for the Clevo P955EP6 and P950 series gaming laptops. It replaces OEM part numbers P950BAT-4, 4ICP5/65/80, 6-87-P950S-51E00, and 6-87-P950S-51E01. Fits P955EP6, P950KP6, P950HP6, P957HR, and seven additional P950-series models.

• P950-series platform fit: These models share a common 4-cell Li-Polymer pack at 15.2V with the same physical connector and BMS handshake protocol. Swapping between P950KP6, P950HP6, P955EP6, and P957HR uses the same cell configuration, so one SKU covers the full line.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a P950-series board. The BMS communicated without error, charge termination triggered correctly at 100%, and protection circuitry tripped as expected under over-current simulation.
• Post-install calibration on the P950 series: After fitting this battery, run the laptop down to hibernate-cutoff under normal use — gaming load works well — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health or capacity warning that appears after every cell swap on these boards.

BIOS reporting battery health as poor immediately after fitting a new P950BAT-4

The P950 BIOS reads cycle count and health data stored in the old cell's EEPROM. When a new cell goes in, that EEPROM data is different — the BIOS flags a mismatch and reports degraded health even though the cell is new. This is not a fault with the replacement cell. Running one complete discharge-to-hibernate followed by a full uninterrupted charge allows the firmware to record a new baseline. After one or two cycles the health indicator normalises.

Laptop shuts down at 20–30% shown on the gauge after battery swap

This happens because the fuel gauge IC on the P950 board is still calibrated to the old cell's discharge curve. Under full load — CPU boost, discrete GPU, and a bright display panel simultaneously — voltage drops faster than the gauge predicts, and the board hits its low-voltage cutoff before the displayed percentage reaches zero. The gauge is reading stale data, not the new cell's actual curve. Run two full discharge-to-hibernate cycles and the fuel gauge IC recalibrates against the new chemistry. After calibration, shutdown should not occur above 5–8% at full load.