Bea-fon SL495 Replacement Battery 3.7V 600mAh Li-ion

Bea-fon SL495 / SL595 / SL605 — 3.7V Li-ion Replacement Battery (1ICP/4/25/40)

This is a 3.7V 600mAh (2.22Wh) Li-ion battery for the Bea-fon SL495, SL595, SL595 Plus, and SL605 mobile phones. It replaces OEM part 1ICP/4/25/40 when the original cell no longer holds a usable charge. Dimensions are 47.30 x 42.20 x 4.30mm — confirm these against your existing battery before fitting.

• SL495 / SL595 / SL605 platform fit: These models share the same battery bay dimensions, voltage rail, and connector pinout. The BMS on each device expects the same 3.7V nominal cell with identical cutoff thresholds, so one cell revision covers the full range.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SL595 platform. The BMS accepted the cell without error flags, and charge termination triggered correctly at full capacity without overrun.
• Fuel gauge recalibration on first use: After fitting, disable any fast-charge mode and run one full discharge-to-charge cycle before normal use. The fuel gauge IC on these phones calibrates its coulomb counter against the cell's discharge curve — skipping this step causes percentage reporting to drift from the first day.

Why the SL495 reports wrong battery percentage after a cell swap

The fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, the IC has no reference data for it and maps voltage readings against the old curve. This produces percentage jumps, early low-battery warnings, or a gauge stuck near 100% well into discharge. One complete discharge cycle — down to automatic shutoff — followed by a full uninterrupted charge resets the coulomb counter and re-anchors the gauge to the new cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem fires or the screen brightness peaks and the cell voltage drops below the BMS cutoff threshold faster than the gauge expects. A 600mAh cell at high impedance cannot sustain the voltage rail under combined load, so the phone interprets the sag as a dead cell and shuts off. Let the phone discharge fully to forced shutdown, then charge uninterrupted to 100% — this recalibrates the gauge so the reported percentage matches actual cell capacity. If shutdowns persist below 3.4V under load, the cell seating or contact strip may need reseating.