Toshiba Portege 7140CT Replacement Battery PA3000UR 10.8V

Toshiba Portege 7140CT Series — 10.8V Li-ion Replacement Battery (PA3000UR)

This is a 10.8V, 3000mAh Li-ion battery for the Toshiba Portege 7140CT and related Portege 7000 series ultraportable notebooks. It replaces OEM part numbers PA3000UR, PA3001U-1BRM, PA2505, PA3000U-1BRS, and PA3001. Capacity is 32.4Wh — matching the original cell specification.

• Portege 7000 series compatibility: The Portege 7000, 7020CT, 7140CT, and 7220CT all share the same 10.8V three-cell battery rail, connector pinout, and BMS handshake protocol. One cell fits all these models without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a Portege 7140CT. The BMS communicated correctly with the system board, reported state-of-charge accurately after two calibration cycles, and held voltage above the low-battery cutoff threshold throughout discharge.
• Post-install calibration on the Portege platform: After fitting this battery, run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears immediately after every cell swap on this platform.

BIOS reporting poor battery health after fitting a new cell

The Portege 7000 series stores battery health data in EEPROM on the system board, not on the cell itself. When a new cell goes in, the BIOS compares current readings against the old cell's stored history and flags the battery as degraded or unknown. This is not a fault with the replacement cell — it is a stale data mismatch. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% overwrites the old EEPROM values and clears the warning within one to two cycles.

Laptop shuts down at 20–30% remaining on the gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge reads 20–30% but the cell has already dropped below the minimum voltage the CPU and display load require — typically around 9.5V under full draw on this platform. The system shuts down before the OS can respond. Run two full calibration cycles — full discharge to hibernate, full charge to 100% each time — and the fuel gauge IC will map the new cell's curve correctly, moving the shutdown point back to the correct threshold near 0%.