About this replacement
Samsung Galaxy Xcover 4 SM-G390F — 3.85V Li-ion Replacement Battery (EB-BG390BBE)
This is a 3.85V, 2800mAh Li-ion battery for the Samsung Galaxy Xcover 4 (SM-G390, SM-G390F, SM-G390Y). It replaces OEM part EB-BG390BBE and EB-BG390BBEGWW. Fit this cell when the original no longer holds sufficient charge or the phone shuts down unexpectedly under load.
- Xcover 4 platform fit: The SM-G390 series shares a single battery bay spec — same 3.85V rail, same connector orientation, same BMS handshake across SM-G390, SM-G390F, and SM-G390Y variants. One cell covers all three.
- Bench tested on actual hardware: We cycled this cell in an SM-G390F and confirmed the BMS accepted the new cell without fault flags. Charge IC engaged normally at 1A and stepped down correctly as the cell approached full state of charge.
- Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one full discharge-to-charge cycle at standard current. This allows the fuel gauge IC to map the new cell's discharge curve before fast-charge current is applied to an uncalibrated cell.
Sudden shutdown at 20–30% on the Xcover 4 after a cell swap
The Xcover 4's fuel gauge IC retains the coulomb counter calibration from the old, degraded cell. When you install a fresh 2800mAh cell, the IC's state-of-charge map no longer matches actual cell voltage. Under modem or screen load, voltage drops faster than the IC expects, and the phone cuts power before the percentage readout reaches zero. One complete discharge-charge cycle at standard current forces the coulomb counter to relearn the new cell's capacity endpoints and eliminates the early shutdown.
USB fast charge not activating after fitting a replacement cell
On the first charge cycle after installation, the Xcover 4's charge IC may not negotiate fast-charge current with the new BMS. The BMS starts in a conservative state and limits inbound current until it confirms cell impedance is within range. Connect to a standard 5V charger — not a fast-charge adapter — for the first full cycle. After that cycle completes, fast charging re-engages at the next charge session once the BMS has confirmed cell health parameters.