Bea-fon X5 Replacement Battery 3.8V 4800mAh 625871PV

Bea-fon X5 Series — 3.8V Li-Polymer Replacement Battery (625871PV)

This 3.8V, 4800mAh Li-Polymer cell replaces OEM part 625871PV in the Bea-fon X5, X5_EU001BO, and X5 Premium smartphones. It restores call, messaging, and app functionality when the original cell has degraded or fails to hold a charge. Dimensions are 71.50 × 58.00 × 6.60mm — verify your tray clearance before fitting.

• X5, X5_EU001BO, and X5 Premium compatibility: All three variants share the same battery tray geometry, connector pinout, and BMS handshake protocol, which is why a single cell covers the full model range. Voltage rail and NTC thermistor placement are identical across the group.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the X5 platform and confirmed the BMS accepted the cell, reported state of charge without error flags, and held voltage above the modem load threshold throughout discharge.
• Fuel gauge recalibration on first use: Disable fast charging for your first complete discharge-charge cycle after fitting this cell. The fuel gauge IC on the X5 was calibrated to the original cell's discharge curve — one full cycle at standard current lets it recalibrate before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the Bea-fon X5 after a cell swap

This is a voltage cliff problem, not a capacity problem. The X5's modem and display pull enough current at once that a new, uncalibrated cell can sag below the shutdown threshold even when the fuel gauge still reads 20–30%. The phone's protection circuit interprets the voltage sag as a fault and cuts power. One full discharge-charge cycle at standard rate lets the coulomb counter map the new cell's actual voltage curve, and the shutdowns stop.

OS showing wrong battery percentage after fitting the 625871PV

The Bea-fon X5 fuel gauge IC stores the discharge curve of the original cell in its calibration table. A replacement cell with even slightly different internal impedance will cause the percentage reading to drift, jump, or plateau. The fix is straightforward: run the battery down to automatic shutdown, then charge uninterrupted to 100% without using the phone. After one complete cycle the fuel gauge maps the new cell curve and percentage tracking stabilises. If erratic readings continue past two cycles, check that the NTC thermistor tab is seated flat against the cell surface.