Apple iPhone SE 1620mAh Replacement Battery 3.82V

Apple iPhone SE — 3.82V Li-Polymer Replacement Battery (616-00107)

This is a 3.82V, 1620mAh lithium-polymer cell that fits the Apple iPhone SE across variants A1724, A1723, and A1662. It replaces the original cell when the phone shuts down early, refuses to hold a charge, or the battery health percentage has dropped significantly. Capacity matches the factory specification at 1620mAh (6.19Wh).

• SE, A1724, A1723, A1662 compatibility: All four variants share the same 90.46 × 32.32 × 3.56mm footprint, the same flex connector pinout, and the same BMS handshake with the iPhone SE's power management IC — so one cell covers the entire SE first-generation lineup.
• Bench tested on actual hardware: We ran this cell on an iPhone SE A1723 and confirmed the BMS negotiated correctly with the PMIC on first boot — charge acceptance started immediately and the power rails held stable under display, modem, and camera load.
• Fuel gauge recalibration on first install: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the iPhone's coulomb counter recalibrate against the new cell's discharge curve before any high-current session pushes into an uncalibrated state.

Why the iPhone SE reports wrong battery percentage after a cell swap

The iPhone SE uses a coulomb counter that builds its fuel gauge model against the original cell's discharge curve over many charge cycles. When a new cell goes in, that stored model no longer matches the actual cell chemistry, so the percentage reading drifts. The OS may show 40% and suddenly drop to 15%, or the percentage may climb and fall without matching real capacity. One full discharge from 100% down to auto-shutoff, followed by an uninterrupted charge to 100%, forces the fuel gauge IC to rebuild its model against the new cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity problem. Under peak load — modem transmit, screen at full brightness, GPS active — the cell voltage can sag below the PMIC's cutoff threshold even when the fuel gauge still reads a healthy percentage. It happens most often on the first few cycles before the coulomb counter has accurate data on the new cell. Run two full discharge-charge cycles and confirm the cell voltage under load stays above 3.4V — if shutdowns persist past that point, reseat the battery connector and verify contact pressure at the flex cable ZIF socket.