About this replacement
Samsung Galaxy S5 Mini SM-G800F / SM-G800Y / SM-G800H — 3.85V Li-ion Replacement Battery (EB-BG800BBE)
This is a 3.85V, 1900mAh Li-ion replacement battery for the Samsung Galaxy S5 Mini. It fits SM-G800F, SM-G800Y, SM-G800H, and related SM-G800 variants. OEM part numbers EB-BG800BBE, EB-BG800CBE, and EG-BG800BBE all cross to this cell.
- SM-G800 series compatibility: The SM-G800F, G800Y, and G800H all run the same 3.85V voltage rail with the same connector pinout and BMS handshake protocol — one cell covers all three without modification.
- Bench tested on actual hardware: We ran this battery through full charge cycles on an SM-G800F. The BMS accepted charge current without fault codes, and the fuel gauge IC tracked state-of-charge correctly after one complete discharge-charge cycle.
- Fuel gauge recalibration on first use: On first installation, disable fast charging and run one full discharge down to automatic shutdown, then charge to 100% uninterrupted. This gives the fuel gauge IC a clean discharge curve to reference against the new cell — skipping this step causes percentage jumps and early shutdowns.
Why the S5 Mini reports wrong battery percentage after a cell swap
The S5 Mini uses a coulomb-counting fuel gauge IC that builds its discharge model from the original cell's characteristics. When a new cell goes in, the IC still references the old curve. The result is percentage readings that lag reality — often showing 40% when the cell is near cutoff. One complete discharge cycle down to automatic shutdown, followed by a full uninterrupted charge to 100%, forces the IC to recalibrate its internal charge table against the new cell. After that cycle, percentage accuracy returns to normal.
Sudden shutdown at 20–30% on a replacement cell
This happens when the fuel gauge IC hasn't recalibrated and the cell voltage drops below 3.4V under screen or modem load before the reported percentage reaches zero. The phone cuts out because the hardware voltage floor trips before the software gauge catches up. It is not a faulty cell — it is a calibration gap. Run one full discharge-charge cycle without interruption, and confirm the cell holds above 3.6V at rest after a 50% charge before resuming normal use.