About this replacement
Samsung Galaxy S III Mini — 3.8V Li-ion Replacement Battery (EB-F1M7FLU)
This is a 3.8V, 1500mAh Li-ion cell built to replace the original battery in the Samsung Galaxy S III Mini (GT-I8190). It fits the compact body of the GT-I8190 exactly, matching the OEM dimensions of 60.40 × 51.00 × 4.10mm. Voltage and capacity match the EB-F1M7FLU specification from Samsung's own part record.
- GT-I8190 platform fit: The S III Mini uses a dedicated battery bay sized for this exact cell footprint. The connector orientation and BMS contact points align with the original Samsung battery housing — no adapter or modification needed.
- Bench tested on actual hardware: We ran this cell on a GT-I8190 unit and confirmed BMS handshake, charge acceptance from stock charger, and stable voltage delivery under simultaneous screen, modem, and Wi-Fi load. No false low-battery trips occurred during testing.
- Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-to-charge cycle before normal use. This allows the GT-I8190's fuel gauge IC to map the new cell's discharge curve before committing coulomb-counter calibration data to memory.
Why the GT-I8190 reports wrong battery percentage after a cell swap
The S III Mini uses a coulomb-counter fuel gauge IC that stores calibration data from the original cell's discharge curve. When a new cell goes in, that stored curve no longer matches the actual cell chemistry, so the percentage display drifts — often reading full well past the true charge level. The IC needs at least one uninterrupted full discharge and charge cycle to write new calibration values. Until that cycle completes, percentage readings will be inaccurate. Let the phone drain to auto-shutdown, then charge to 100% without interruption to trigger recalibration.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops sharply under combined modem and display load — a voltage cliff the fuel gauge IC didn't predict because it was still calibrated to the old cell. A fresh Li-ion cell can hit this cliff earlier in its life before the BMS learns the new discharge profile. The phone interprets the voltage sag as a critical low and cuts power to protect the cell. After one full calibration cycle, the shutdown threshold settles closer to the correct 3.4–3.5V floor.