Samsung Galaxy A03 Core SLC-50 Replacement Battery 3.85V 4900mAh

Samsung Galaxy A03 Core — 3.85V Li-Polymer Replacement Battery (SLC-50)

This is a 3.85V, 4900mAh Li-Polymer battery that replaces the original SLC-50 cell in the Samsung Galaxy A03 Core. It fits SM-A032F, SM-A032F/DS, SM-A032M, and related variants. Swap it in when the original cell no longer holds a charge or the phone shuts down unexpectedly under load.

• SM-A032F / SM-A032M compatibility: These variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. One SLC-50 cell covers the full A03 Core line without modification.
• Bench tested on actual hardware: We ran this cell through full charge cycles on an SM-A032F unit. The BMS accepted the charge IC handshake correctly, and the protection circuit tripped at the expected low-voltage cutoff threshold without false positives.
• First-cycle fuel gauge reset: After installing this cell, disable fast charging and run one complete discharge down to auto-shutdown, then charge to 100% uninterrupted. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins on an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the A03 Core after a cell swap

This happens because the fuel gauge IC is still using the discharge curve from the degraded original cell. When screen brightness peaks or the modem hits full transmit power, the new cell's actual voltage drops below the shutdown threshold faster than the gauge predicts. The phone reads 25% but the cell is already at the low-voltage cutoff. One full discharge-to-shutdown followed by an uninterrupted charge to 100% recalibrates the coulomb counter against the new cell and stops the premature cutoffs.

Battery percentage jumping erratically after replacement

Erratic percentage jumps — 60% dropping to 40% in seconds, or climbing back without charging — point to a fuel gauge IC that hasn't recalibrated to the new cell's internal resistance profile. The old calibration data stored in the gauge doesn't match the new cell's impedance curve, so the reported state-of-charge swings wildly between readings. Avoid partial top-ups for the first two cycles. Let the phone discharge fully to auto-shutdown, then charge to 100% in one unbroken session — twice — to anchor the gauge to accurate reference points.