Samsung Galaxy S23 EB-BS912ABY Replacement Battery 3.88V 3750mAh

Samsung Galaxy S23 Series — 3.88V Li-Polymer Replacement Battery (EB-BS912ABY)

This is a 3750mAh Li-Polymer cell at 3.88V nominal, built to replace the original EB-BS912ABY in the Samsung Galaxy S23 lineup. It fits the SM-S911B, SM-S911T, SM-S911W, and eight additional S23 variants that share the same battery bay and BMS handshake. Capacity and voltage match the factory specification exactly.

• S23 variant compatibility: Every SM-S911 model in this series runs the same 3.88V power rail, uses the same flex connector, and communicates with the same fuel gauge IC — which is why one cell covers the full range without hardware modification.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on an SM-S911B, confirming the BMS accepted the cell without a fault flag and that the coulomb counter tracked state-of-charge without jumping at low percentages.
• Fuel gauge recalibration on first use: After installation, disable fast charging and complete one full discharge down to automatic shutdown, then charge to 100% on standard 15W. This gives the fuel gauge IC one clean cycle to map the new cell's actual discharge curve before any high-current session runs against an uncalibrated table.

Sudden shutdown at 20–30% on the S23 after a cell swap

The S23's fuel gauge IC stores a learned discharge curve from the original cell. When you install a fresh cell, that stored curve no longer matches the new cell's actual voltage-to-capacity profile. At around 20–30% reported charge, the real cell voltage can drop below the modem and display load threshold before the OS has time to trigger a graceful shutdown. This is a calibration mismatch, not a defective cell. One full discharge-to-shutdown followed by an uninterrupted charge to 100% rewrites the curve. After that cycle, shutdowns at elevated percentages stop.

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

On the first charge after installation, some S23 units present a standard 5W charge rate rather than triggering the 25W USB-PD handshake. The charge IC runs a brief cell-health interrogation on an unfamiliar BMS and defaults to a lower current profile until it receives a valid response. This is normal first-cycle behaviour — it is not a charger fault or a cable fault. Disconnect, wait 30 seconds, reconnect with the original Samsung 25W adapter, and the PD negotiation completes at the correct rate.