About this replacement
Samsung Galaxy S23+ — 3.88V Li-Polymer Replacement Battery (EB-BS916ABY)
This 3.88V, 4600mAh Li-Polymer cell replaces the original battery in the Samsung Galaxy S23+ and SM-S916B/SM-S916W variants. It matches the OEM voltage rail, physical dimensions, and connector pinout for the S23+ chassis. Capacity is 4600mAh (17.85Wh) — pulled directly from product data, not estimated.
- SM-S916 platform fit: The S23+ and S23 Plus share the same battery bay geometry, flex connector, and BMS handshake protocol. Any variant in the SM-S916 series uses the same EB-BS916ABY specification, so one cell covers the full lineup without modification.
- Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on an SM-S916B unit. The BMS accepted the charge without fault flags, and the fuel gauge IC tracked voltage correctly across the discharge curve.
- Fuel gauge recalibration on first use: On first installation, disable fast charging and run one complete discharge-charge cycle at standard speed. This lets the coulomb counter IC map the new cell's discharge curve before adaptive charging algorithms apply high-current profiles to an uncalibrated cell.
Sudden shutdown at 20–30% on the S23+ after a cell swap
The S23+ runs a Snapdragon 8 Gen 2 with a high-power modem and a 120Hz LTPO display — both spike current draw instantly. A new cell with an uncalibrated fuel gauge IC can report 25% remaining while actual cell voltage is already near the BMS cutoff threshold. When the modem or screen triggers a current spike, the cell voltage drops below 3.4V and the BMS cuts output before the OS registers low battery. One full slow discharge-charge cycle syncs the coulomb counter to the actual cell curve and eliminates this behaviour.
USB-PD fast charge not activating on the first cycle after installation
Samsung's adaptive fast charging protocol requires a BMS handshake before the charge IC negotiates elevated current. On a freshly installed cell, the BMS may not complete that handshake on the first charge attempt, so the phone defaults to standard 5W input. This is not a fault in the cell or the charger. Disconnect, reboot the device, and reconnect the charger — the handshake completes on the second attempt and fast charging resumes at the rated input voltage.