Tiptel Ergophone 6060 Replacement Battery SD474050A 3.7V

Tiptel Ergophone 6060 — 3.7V Li-ion Replacement Battery (SD474050A)

This 3.7V Li-ion cell replaces the original SD474050A battery in the Tiptel Ergophone 6060 smartphone. Rated at 1150mAh (4.26Wh), it restores the phone's ability to handle calls, messaging, and standard functions when the original cell has degraded or failed. Dimensions are 53.50 x 40.13 x 5.40mm — confirm clearance in the battery bay before fitting.

• Ergophone 6060 fit: The 6060 uses a compact Li-ion pack with a low-current BMS tuned for a voice-primary load profile. This cell matches the connector pinout and voltage rail the phone's charge IC expects, so the handshake between the BMS and the board completes without errors.
• Bench tested on actual hardware: We ran charge and discharge cycles on the Ergophone 6060 platform and confirmed the BMS accepted the cell, reached full charge termination cleanly, and held voltage under typical call and screen-on load without tripping the protection circuit.
• Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge mode for the first full discharge-to-charge cycle. The fuel gauge IC in the 6060 is calibrated to the old cell's discharge curve — one full cycle at standard current lets it remap against the new cell before higher charge rates are applied.

Why the Ergophone 6060 reports wrong battery percentage after a cell swap

The 6060's fuel gauge IC uses a coulomb counter that builds its state-of-charge model from historical charge and discharge data. When you swap the cell, that learned model no longer matches the new cell's actual capacity and internal resistance. The phone reads voltage and applies the old curve, which shifts the reported percentage away from reality — often reading 100% early or dropping suddenly near the end. One complete discharge down to auto-shutdown followed by a full charge to 100% resets the counter and aligns the gauge to the new cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage-cliff failure, not a capacity problem. Under modem or display load, the cell voltage drops faster than the fuel gauge predicted — the phone sees the rail sag below its minimum operating threshold and cuts power before the gauge reaches 0%. It happens most often when the fuel gauge IC is still calibrated to the old cell curve and cannot predict the new cell's voltage drop under load. Run one full discharge cycle without interruption, letting the phone shut down on its own, then charge fully to 4.2V — the gauge recalibrates and the premature cutoff stops.