M-Life ML0639 Nokia N95 Replacement Battery 3.7V 1200mAh

M-Life Nokia N95 N-Series — 3.7V Li-ion Replacement Battery (ML0639)

This M-Life ML0639 is a 3.7V Li-ion cell rated at 1200mAh (4.44Wh), built to replace the original battery in Nokia N95 and related N-series smartphones. It fits where the factory cell sits and uses the same connector and contact layout. Install it when the original cell can no longer hold charge through a normal use day.

• Nokia N-series fitment: The N95 and its N-series siblings share the same battery bay dimensions, contact pitch, and BMS handshake voltage window. This cell measures 60.00 × 43.80 × 4.50mm — the same footprint as the OEM unit — so the cover closes without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on an N95 unit. The BMS accepted the cell without error flags, charge termination triggered correctly at 4.2V, and protection cutoff activated at the expected low-voltage threshold.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging if your device supports it and run one complete discharge-to-charge cycle before normal use. The Nokia fuel gauge IC was calibrated to the old cell's discharge curve — one full cycle lets it map the new cell and report accurate percentages.

Why the N95 reports wrong battery percentage after a cell swap

The N95 tracks charge state using a coulomb counter that was calibrated over many cycles with the original cell. A new cell has a different internal resistance and a slightly different discharge curve. Until the fuel gauge IC runs at least one full cycle against the new cell, the percentage reading lags or jumps. After one complete discharge from 100% to automatic shutdown followed by a full charge, the reported percentage will track the actual cell state accurately.

Sudden shutdown at 20–30% on the replacement cell

This happens because the fuel gauge IC still holds the old cell's voltage-to-capacity map. The new cell's voltage drops faster under modem or display load at lower states of charge than the old cell did, hitting the BMS cutoff threshold before the displayed percentage reaches zero. The phone interprets this as a hardware protection event, not a low-battery shutdown. Run one full discharge cycle — let the phone shut itself off naturally — then charge uninterrupted to 100% to let the coulomb counter reset to the new discharge curve.