Samsung Galaxy Z Flip EB-BF701ABY Replacement Battery 3.85V 850mAh

Samsung Galaxy Z Flip — 3.85V Li-Polymer Replacement Battery (EB-BF701ABY)

This is a 3.85V, 850mAh Li-Polymer replacement battery for the Samsung Galaxy Z Flip foldable smartphone. It carries OEM part number EB-BF701ABY and fits SM-F7000, SM-F700W/DS, SM-F700N, and related variants. Replace this cell when the original has degraded past the point of holding a useful charge through a normal day.

• Z Flip SM-F700 platform fit: The SM-F700 series shares a single battery bay geometry, connector pinout, and BMS handshake protocol across all regional variants. The EB-BF701ABY cell slots into all of them without modification to the flex connector or charge IC communication lines.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an SM-F700 unit. The BMS accepted the cell without a fault flag, charge current ramped correctly through CC and CV phases, and the protection circuit tripped cleanly at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. The coulomb counter in the fuel gauge IC calibrates against the new cell's discharge curve during this cycle — skipping it can leave the IC reading against the old cell's profile, causing erratic percentage jumps early on.

Sudden shutdown at 20–30% on the Z Flip after a cell swap

The Z Flip's Snapdragon 855 platform pulls a sharp current spike when the modem switches between LTE bands or the foldable display refreshes at full brightness. A new cell with an uncalibrated fuel gauge IC can report 25% remaining while the actual resting voltage has already dropped to near the BMS cutoff threshold under that load. The protection circuit reads the voltage sag as a fault and shuts the board down before the OS can intervene. Run that full recalibration cycle first — after one complete discharge below 5% and a full charge to 100%, the IC maps the new cell's voltage-to-capacity curve and the shutdowns stop.

USB-PD fast charge not activating on the first cycle after replacement

After a cell swap, the charge IC on the Z Flip sometimes stays in trickle mode and will not negotiate the fast charge handshake with the charger on the first session. This happens because the IC starts in a conservative recovery state when it detects a new cell — it checks internal resistance before allowing high-current input. Plug into a Samsung 25W USB-PD adapter, let the phone charge uninterrupted to 100% without removing the cable, and the IC will clear the conservative flag. Fast charging activates normally on the next session once the cell's impedance reading is logged.