Bea-fon SL470 Replacement Battery 3.7V 1000mAh Li-ion

Bea-fon SL470 / SL570 Series — 3.7V Li-ion Replacement Battery (SL470/SL570)

This is a 3.7V, 1000mAh Li-ion cell built to replace the original battery in the Bea-fon SL470, SL570, SL670A, and SL670_EU001W. It shares the same 47.10 × 44.00 × 5.50mm footprint as the factory cell. Voltage and connector match the original so the phone's charge circuit accepts it without modification.

• SL470 / SL570 / SL670 platform fit: These models share the same battery bay dimensions, connector pinout, and 3.7V supply rail. One cell covers the full lineup because the BMS handshake parameters are consistent across all variants.
• Bench tested on actual hardware: We cycled the cell through charge and discharge on a SL470 unit. The phone's charge IC accepted the new cell on the first connection, BMS protection tripped correctly at the low-voltage cutoff, and the phone completed a full charge without error flags.
• Fuel gauge recalibration on first use: After fitting this cell, run one complete discharge down to auto-shutdown, then charge uninterrupted to 100% before using the phone normally. The SL470's fuel gauge IC needs a full reference cycle to map the new cell's discharge curve — skipping this produces inaccurate percentage readings from the start.

Why the SL470 reports wrong battery percentage after a cell swap

The SL470 uses a fuel gauge IC that tracks charge state against a stored discharge curve from the original cell. A new cell has a different internal impedance profile, so the IC's coulomb counter falls out of sync immediately. The phone may show 80% and shut down minutes later, or sit at 20% for an extended period. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the reference points the gauge uses for all future readings.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity fault. Under load — screen backlight, active call, or network search — the cell's terminal voltage drops sharply below the 3.0V threshold the SL470's protection circuit monitors. The phone shuts down to protect the cell even though the displayed percentage suggests charge remains. It is most common on the first few cycles before the fuel gauge IC has calibrated to the new cell. Run the recalibration cycle described above; if the shutdown persists past three full cycles, check that the battery connector is fully seated and that contact resistance is below 0.5Ω.