About this replacement
Samsung Galaxy S5 Mini — 3.85V Li-ion Replacement Battery (EB-BG800BBE)
This 3.85V 2100mAh Li-ion battery replaces the original cell in the Samsung Galaxy S5 Mini. It fits SM-G800F, SM-G800Y, SM-G800H, and related variants. OEM part numbers covered: EG-BG800BBE, EB-BG800BBE, and EB-BG800CBE.
- SM-G800 series compatibility: All SM-G800 variants share the same 3.85V single-cell architecture, connector pinout, and BMS handshake protocol — the same physical cell and charge circuit runs across the entire Mini sub-family.
- Bench tested on actual hardware: We ran this cell in an SM-G800F and cycled it through two full discharge-charge passes. The BMS accepted charge on the first cycle without triggering overcurrent or overvoltage cutoff. Cell voltage at full charge held steady at 4.35V.
- Fuel gauge recalibration on first use: On first installation, disable fast charging and run one complete discharge down to automatic shutdown, then charge to 100% uninterrupted. This lets the fuel gauge IC map its coulomb counter against the new cell's discharge curve before normal use resumes.
Why the S5 Mini reports the wrong battery percentage after a cell swap
The S5 Mini uses a fuel gauge IC that tracks charge state by counting coulombs against a stored discharge curve from the original cell. When you fit a new cell, that stored curve no longer matches the actual chemistry. The IC reports percentage based on stale reference data, so readings drift — especially between 30% and 70%. One full discharge-to-shutdown followed by a complete uninterrupted charge resets the reference baseline and brings the display reading back into alignment with real capacity.
Sudden shutdown at 20–25% on the replacement cell
This happens when the cell voltage drops below the modem or display's minimum rail requirement under load — even though the fuel gauge still shows charge remaining. A new cell with an uncalibrated IC can misread state-of-charge by 15–20%, so "25%" on screen may actually be near 3.3V open-circuit. Under LTE transmission or screen brightness spikes, instantaneous current draw pulls voltage below the 3.2V BMS cutoff and the phone shuts off. Run the recalibration cycle described above and check that resting voltage after shutdown reads no lower than 3.4V before recharging.