About this replacement
Samsung Galaxy Z Flip — 3.88V Li-Polymer Replacement Battery (EB-BF700ABY)
The EB-BF700ABY is a 3.88V, 2300mAh Li-Polymer cell for the Samsung Galaxy Z Flip foldable smartphone. It fits SM-F7000, SM-F700W/DS, SM-F700N, and related variants. Install this when the original cell no longer holds a charge or the phone shuts down before the percentage hits zero.
- Z Flip foldable platform fit: The SM-F700 series shares a single battery bay and BMS handshake across regional variants. The same connector pinout, cell dimensions (63.55 × 45.80 × 4.65mm), and charge IC communication protocol run across all listed models, which is why one cell covers the full lineup.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on an SM-F700 unit. The BMS accepted the cell on first connection, charge termination triggered correctly at full capacity, and the protection circuit responded normally to simulated load spikes from the modem and display.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the coulomb counter begins tracking incremental charge states.
Why the Z Flip reports wrong battery percentage after a cell swap
The fuel gauge IC in the SM-F700 stores a learned discharge curve from the previous cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry, so the percentage readout drifts — sometimes by 10–15 points. The IC needs one full reference cycle to rebuild its model. Run the phone from 100% down to automatic shutdown, then charge uninterrupted to 100% with fast charging off. After that cycle, the reported percentage should track actual cell voltage closely.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops sharply under high-current load — the modem transmitting, the foldable display refreshing at full brightness — faster than the fuel gauge IC predicted. The IC thinks 25% capacity remains, but the cell voltage sags below the BMS cutoff threshold under that draw and the phone cuts off. It is a calibration gap, not a faulty cell. Perform the single full discharge-charge reference cycle described above; after recalibration, the shutdown threshold should align with the real voltage floor near 3.40V.