Bea-fon SL260 Replacement Battery 3.7V 1200mAh BEA2401

Bea-fon SL260 / SL260 LTE — 3.7V Li-ion Replacement Battery (BEA2401)

This is a 3.7V, 1200mAh Li-ion battery replacing part number BEA2401 in the Bea-fon SL260 and SL260 LTE mobile phones. It matches the original cell dimensions at 53.20 × 34.00 × 5.70mm, so it sits correctly in the battery bay without modification. Capacity figures come from the product data: 1200mAh / 4.44Wh.

• SL260 and SL260 LTE coverage: Both variants share the same battery bay geometry and BMS handshake protocol. The LTE model draws higher sustained current during data transmission, but both run on this same 3.7V cell — no separate part number is needed for either variant.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SL260 platform. The BMS accepted the cell without rejection flags, and the protection circuit triggered correctly at the low-voltage cutoff threshold during deep discharge testing.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging for one complete discharge-charge cycle. The SL260's fuel gauge IC is calibrated to the old cell's discharge curve. Running one full cycle at standard charge current lets the coulomb counter reset its reference points before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the SL260 after a cell swap

This happens because the fuel gauge IC still references the discharge voltage curve of the original, degraded cell. The new cell has a steeper voltage drop under modem or screen load than the old worn cell did — the phone reads 25% but the actual cell voltage is already hitting the hardware cutoff. The OS shuts down before the gauge catches up. Running two or three full discharge-charge cycles without fast charging retrains the coulomb counter to the new cell curve and the shutdowns stop.

Phone showing wrong battery percentage after fitting the replacement

The SL260's fuel gauge IC stores learned capacity data from the previous cell. After a swap, that stored data no longer matches the new cell, so percentage readings jump or sit at an incorrect value. Charge the phone to 100% until charging stops naturally, then allow it to discharge to auto-shutdown without interruption — do not top up mid-cycle. After one full cycle the IC writes new reference data and percentage accuracy returns. If the reading is still erratic after two cycles, power the phone fully off between cycles to force a BMS re-initialisation before charging again.