Fujitsu M1010 Replacement Battery 14.4V 2200mAh Li-ion

Fujitsu Lifebook M1010 — 14.4V Li-ion Replacement Battery (DPK-CWXXXSYA4)

This 14.4V Li-ion cell replaces the original battery in the Fujitsu Lifebook M1010 ultraportable notebook. It fits the M1010 and CWOAO variants and carries a 2200mAh (31.68Wh) capacity matching the OEM specification. Install it when the existing cell no longer holds a usable charge or the system shuts down unexpectedly under load.

• M1010 and CWOAO platform fit: Both variants share the same 14.4V voltage rail, physical connector, and BMS handshake protocol, so a single cell covers the full M1010 family without modification or adapter.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on an M1010 unit. The BMS communicated correctly with the system controller, accepted a full charge to 100%, and held the low-voltage cutoff at the expected threshold without tripping a false protection event.
• Post-install calibration on the M1010: After fitting this cell, run one full discharge until the laptop hibernates on low-battery cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting poor battery health immediately after fitting the new cell

The M1010 BIOS reads health data stored in the battery's EEPROM and compares it against a learned baseline from the previous cell. When a new cell is installed, the EEPROM data does not yet match what the BIOS expects, so it flags the battery as degraded or unknown even though the cell is fresh. This is a firmware reading issue, not a fault with the replacement cell. Run the calibration cycle described above — one full discharge to hibernate, then a full uninterrupted charge — and the BIOS will rebuild its baseline against the new cell's actual characteristics.

Laptop shuts down at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated its capacity model against the new cell's discharge curve. The IC predicts 20–30% remaining based on old data, but the cell voltage drops below the safe threshold faster than the model expects under combined CPU and display load, triggering an immediate shutdown. It is not a defective cell — it is a calibration mismatch. Complete two to three full discharge-to-hibernate and charge-to-100% cycles, and the fuel gauge IC will track the actual voltage cliff accurately. After calibration, the shutdown should align with a displayed charge of 5% or lower, around 13.5V under load.