EB-BS922ABE Samsung Galaxy S24 Compatible Battery 3.88V 3800mAh

Samsung Galaxy S24 — 3.88V Li-Polymer Replacement Battery (EB-BS922ABE)

This is a 3800mAh Li-Polymer cell at 3.88V, built to replace the original EB-BS922ABE battery in the Samsung Galaxy S24. It fits the SM-S921Q, SM-S921J, SM-S921D, and related S921 variants. If your S24 is shutting down unexpectedly, losing charge faster than it used to, or refusing to hold a charge at all, this swap addresses the degraded cell directly.

• S921 series fitment: All SM-S921 variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The 68.00 × 60.10 × 5.10mm cell fits the cavity without modification, and the flex connector seats to the same board-side socket across all regional S24 models.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an S24 board to verify BMS communication, confirm the charge IC accepted the cell without throwing fault flags, and check that the coulomb counter initialised correctly on the first full cycle.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current fast charging begins pushing current into an uncalibrated cell — skipping this step is the primary cause of erratic percentage readings after a swap.

Why the S24 reports wrong battery percentage after a cell swap

The S24 uses a coulomb counter and a learned discharge curve stored in the fuel gauge IC to calculate percentage. When you replace the cell, the IC still references the old cell's degraded curve. The result is a percentage readout that drifts — often showing 15–20% more charge than the cell can actually deliver under modem or display load. One full slow discharge-charge cycle overwrites the stored curve with data from the new cell, restoring accurate percentage reporting. Until that cycle completes, the display percentage is an estimate based on stale data.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff, not a BMS fault. Under peak modem load — 5G handshake, screen-on browsing — the S24 draws current spikes that a partially discharged Li-Polymer cell cannot sustain at terminal voltage. If the cell drops below approximately 3.2V instantaneously under that load, the phone cuts power to protect the board even though the displayed percentage reads higher. The fix is completing the fuel gauge recalibration cycle first, then checking that no background apps are stacking high-draw tasks during low-charge periods. If shutdowns continue after calibration, confirm the flex connector is fully seated — a partial connection raises internal resistance and amplifies voltage sag.