Samsung Galaxy S9 Plus EB-BG965ABE Replacement Battery 3500mAh

Samsung Galaxy S9 Plus — 3.85V Li-Polymer Replacement Battery (EB-BG965ABE)

This 3.85V, 3500mAh Li-Polymer cell replaces the original battery in the Samsung Galaxy S9 Plus and S9+ (SM-G965 series). It fits the SM-G9650/DS, SM-G965N, and related variants sharing the EB-BG965ABE form factor. Capacity matches the factory specification at 13.48Wh.

• SM-G965 series fit: All SM-G965 variants use the same 78.68 × 45.56 × 5.60mm cell envelope, the same flex connector pinout, and communicate with the charge IC over the same BMS protocol — which is why one cell covers the full range of regional model numbers.
• Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on an SM-G965F. The BMS handshook correctly with Samsung's charge IC on first contact, and the coulomb counter initialised without error flags in the battery status register.
• First-cycle calibration tip: 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 charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity defect. Under peak modem or display load, the cell voltage can drop sharply below the threshold the OS uses to predict remaining charge — triggering a protective shutdown before the gauge reads zero. It happens most often in the first few cycles on a fresh cell because the fuel gauge IC is still calibrated to the old, degraded discharge curve. Running one full discharge to shutdown followed by a complete charge resets the coulomb counter reference and typically eliminates the early cutoff.

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

After a cell swap, Samsung's Adaptive Fast Charging negotiation can stall on the first charge cycle — the phone falls back to standard 5V/1A input even when a fast charger is connected. This happens because the charge IC runs a brief conditioning pass on an unknown cell before it allows elevated current. Disconnect the charger, power the phone fully off, then reconnect — the IC re-enters negotiation from a clean state. Fast charge typically resumes normally from the second cycle onward.