Samsung Galaxy S III EB-L1G6LLU Replacement Battery 3.7V 1400mAh

Samsung GT-I9300 / GT-I9308 — 3.7V Li-ion Replacement Battery (EB-L1G6LLU)

This is a 3.7V, 1400mAh Li-ion cell that replaces the original battery in the Samsung Galaxy S III and its regional variants, including the GT-I9300, GT-I9308, SGH-T999V, and SHW-M440S. It fits all models sharing the EB-L1G6LLU part number family. Physical dimensions are 63.00 × 50.40 × 5.40mm — matching the original bay exactly.

• GT-I9300 series compatibility: All models in this group use the same connector pinout, voltage rail at 3.7V nominal, and BMS handshake logic. The EB-L1G6LLU family covers regional SKUs — EB-L1G6LLUC, EB-L1G6LVA, EB-L1G6LLK, EB-L1G6LLZ, and GH43-03699A — that are electrically identical.
• Bench tested on actual hardware: We ran this cell in a GT-I9300 unit. The BMS accepted the cell without rejection flags. Charge acceptance held across a full cycle from depleted state to cutoff. The protection circuit responded correctly to over-discharge conditions.
• Fuel gauge recalibration after swap: On first use after installation, disable fast charging and run one complete discharge-charge cycle before relying on the percentage indicator. The fuel gauge IC is still calibrated to the old cell's discharge curve. One full cycle lets it map the new cell before high-current charging begins.

Sudden shutdown at 20–30% on the GT-I9300 after a cell swap

The Galaxy S III's fuel gauge IC holds a learned discharge curve from the original cell. When a new cell is installed, that curve no longer reflects actual voltage behavior under load. The modem radio and display together can pull enough current to cause a voltage drop the old curve didn't predict — so the phone shuts down even though the raw state of charge looks fine. This is a calibration issue, not a cell defect. Run two full discharge-charge cycles without interruption, and the coulomb counter will re-anchor to the new cell's actual voltage cliff point.

Phone won't power on after the replacement battery sat in storage

Li-ion cells discharged below approximately 2.5V trigger a BMS lockout — the protection circuit disconnects the cell to prevent damage from over-discharge recovery. If the replacement shipped in a deeply discharged state, the phone may show no response when inserted. Connect the phone to a wall charger rated at least 5V/1A and leave it for 20–30 minutes without pressing the power button. Once the BMS detects trickle charge current and the cell climbs above the lockout threshold — around 2.8–3.0V — the phone will boot normally.