About this replacement
Samsung Galaxy S24+ — 3.88V Li-Polymer Replacement Battery (EB-BS926ABY)
This is a 3.88V, 4600mAh (17.85Wh) Li-Polymer replacement battery for the Samsung Galaxy S24+ (SM-S926 series). It fits all SM-S926 variants and directly replaces OEM part EB-BS926ABY or GH82-33334A. Install it when the original cell has degraded and the phone can no longer hold a charge through a normal day.
- SM-S926 series compatibility: All SM-S926 variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The fuel gauge IC on every S24+ communicates over a single-wire interface — this cell's embedded BMS speaks that protocol without modification.
- Bench tested on actual hardware: We cycled this cell on an SM-S926B through charge, full discharge, and a second charge while monitoring BMS cutoff voltages. The protection circuit tripped correctly at the low-voltage threshold and accepted a full USB-PD charge cycle without negotiation errors.
- First-cycle calibration on the S24+: On first use after installation, disable fast charging for one complete discharge-charge cycle. The S24+ fuel gauge IC holds the old cell's discharge curve in memory. Running one slow cycle lets the coulomb counter recalibrate against the new cell before high-current fast charging pushes current into an uncalibrated state.
Why the S24+ reports wrong battery percentage after a cell swap
Samsung's fuel gauge IC on the S24+ tracks charge state using a coulomb counter anchored to the original cell's discharge curve. When you swap in a new cell, that stored curve no longer matches the new cell's actual voltage-versus-capacity profile. The result is percentage readings that appear stuck, jump suddenly, or hit 100% faster than the cell is actually full. One full discharge down to auto-shutdown followed by a slow charge to 100% forces the IC to rebuild its reference curve against the new cell.
Sudden shutdown at 20–30% on the replacement cell
This happens when the fuel gauge IC hasn't recalibrated and the phone hits an actual cell voltage of around 3.5V while still displaying 25% remaining. Under modem or display load, current draw spikes and the cell voltage drops below the BMS protection floor faster than the OS can register the change. The phone shuts down hard to protect the cell. To clear this, run the phone down to auto-shutdown without fast charging enabled, then charge uninterrupted to 100% — after one full cycle the fuel gauge IC anchors its cutoff estimate to the correct voltage floor.