About this replacement
Samsung Galaxy M23 5G / F23 5G — 3.85V Li-Polymer Replacement Battery (EB-BM526ABS)
This is a 3.85V, 4900mAh Li-Polymer replacement battery for the Samsung Galaxy M23 5G and Galaxy F23 5G. It fits SM-A235F and SM-A235F/DS variants using OEM part number EB-BM526ABS. Replace a degraded original cell and restore full phone functionality — calling, browsing, apps, and 5G modem load.
- M23 5G and F23 5G shared platform: Both devices run the same Snapdragon 750G board with identical voltage rails, connector pinout, and BMS handshake protocol. One cell fits both without modification.
- Bench tested on actual hardware: We ran this cell through full charge and load cycles on the SM-A235F board. The BMS accepted charge negotiation correctly, protection cutoffs triggered at expected thresholds, and the fuel gauge IC tracked state-of-charge without dropout.
- First-cycle fast charge behaviour: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current fast charging pushes current into an uncalibrated cell.
Why the M23 5G reports wrong battery percentage after a cell swap
The Galaxy M23 5G uses a coulomb counter inside the fuel gauge IC to track charge. That counter was calibrated against the discharge curve of the original cell. When a new cell goes in, the stored calibration data no longer matches the actual chemistry, so the percentage readout drifts — often reading 100% while the phone still shuts down early. One full discharge to system shutdown followed by an uninterrupted charge to 100% forces the IC to rewrite its reference curve. After that cycle, percentage accuracy returns to normal.
Sudden shutdown at 20–30% on the replacement cell
This is a voltage cliff problem, not a capacity problem. Under heavy load — 5G modem active, screen at full brightness, background sync — the cell voltage drops sharply below the BMS cutoff threshold even though the fuel gauge still shows charge remaining. It happens most often on replacement cells before calibration. The fix is the same full discharge-charge recalibration cycle described above. If shutdowns continue past two full cycles, check that the battery connector is fully seated — a partial connection raises contact resistance and accelerates voltage sag under load, triggering cutoff at 3.0V.