Dynabook Satellite Pro C40-G-11G Compatible Battery 7.6V 6000mAh

Dynabook Satellite Pro C40-G Series — 7.6V Li-Polymer Replacement Battery (4588105-2S)

This 7.6V, 6000mAh (45.6Wh) Li-Polymer cell replaces the original battery in the Dynabook Satellite Pro C40-G series. It fits the C40-G-11G, C40-G-13E, C40-G-13F, C40-G-120, and fourteen additional variants sharing the same OEM part reference. Voltage, connector pinout, and BMS handshake match the original specification.

• C40-G platform fit: All listed C40-G variants run the same 7.6V two-cell Li-Polymer architecture with a shared BMS connector and identical EEPROM handshake protocol. Swapping between any listed model number does not require firmware changes or adapter hardware.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a C40-G unit. The BMS completed handshake on first connect, the BIOS recognised the cell without prompting, and charge current stepped down correctly at 95% as expected for this platform.
• Post-install calibration cycle: After fitting, run the laptop on battery until it shuts down at hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to complete against the new cell's actual chemistry and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after fitting a new cell

The C40-G BIOS reads health data from EEPROM stored on the battery PCB. When a new cell arrives, that EEPROM holds factory-default values that do not match the existing learn-cycle history the BIOS expects. The system flags this mismatch as degraded health even though the cell is new. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% rewrites the learn-cycle data and clears the warning. After two to three full cycles, the reported health percentage should settle at 95–100%.

Laptop cuts out at 20–30% battery shown — not at zero

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. Under combined CPU and display load, the cell voltage drops faster than the uncalibrated gauge predicts, hitting the BMS low-voltage cutoff while the OS still shows charge remaining. It is not a faulty cell. Run two complete discharge cycles from 100% down to hibernate cutoff without interruption. After the second cycle, the fuel gauge IC recalibrates its slope and the displayed percentage at shutdown will track accurately down toward 5%.