Samsung Galaxy A10s Replacement Battery SCUD-WT-N6 3.85V

Samsung Galaxy A10s / A20s — 3.85V Li-Polymer Replacement Battery (SCUD-WT-N6)

This is a 3.85V, 3900mAh lithium-polymer cell for the Samsung Galaxy A10s and A20s (SM-A107 series, 2019). It replaces OEM part SCUD-WT-N6 and restores full phone function — calls, display, and apps. Dimensions are 87.10 × 65.90 × 4.00mm, matching the original cavity and connector layout.

• SM-A107 series compatibility: The A10s and A20s share the same battery bay dimensions, connector pinout, and BMS handshake protocol — which is why one cell number covers both devices. Voltage rail and NTC thermistor wiring are identical across the SM-A107 variants listed.
• Bench tested on actual hardware: We cycled this cell on an SM-A107F, monitoring BMS charge acceptance and cutoff thresholds. The cell accepted CC/CV charge correctly and the protection circuit tripped at expected over-voltage and over-current limits.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one full discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter to the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the Galaxy A10s after a cell swap

This is a voltage cliff issue, not a capacity problem. Under heavy load — active LTE modem, screen at full brightness, or a background sync burst — the new cell's terminal voltage drops sharply below the threshold the OS uses to trigger emergency shutdown. The fuel gauge IC is still calibrated to the old cell's impedance curve, so it reports 25% remaining while actual deliverable voltage has already collapsed. One full discharge to auto-off followed by an uninterrupted charge to 100% resets the coulomb counter and clears the mismatch.

Phone shows incorrect battery percentage after replacing SCUD-WT-N6

The Samsung fuel gauge IC stores a learned discharge curve from the original cell. After swapping to a new cell, that stored curve no longer matches actual cell behaviour, so percentage readings jump or stall. The fix is a full calibration cycle: run the phone down until it shuts off automatically, then charge in one continuous session to 100% without interruption. After that cycle the coulomb counter recalibrates to the new cell's actual voltage-to-capacity curve and percentage accuracy returns. If jumping persists after two cycles, check that the connector is fully seated — a partial contact causes intermittent voltage readings at the gauge IC.