Samsung Galaxy Note II SCH-I605 Replacement Battery 3.8V 3100mAh

Verizon SCH-I605 (Galaxy Note II) — 3.8V Li-ion Replacement Battery

This 3.8V Li-ion cell replaces the original battery in the Verizon Samsung Galaxy Note II (SCH-I605, SCHI605TSV, SCHI605ZWV). It delivers 3100mAh capacity across the phone's Exynos processor, 5.5-inch Super AMOLED display, and LTE radio. It fits the same battery bay and uses the same connector as the factory cell.

• SCH-I605 variant compatibility: All three Verizon Note II model codes — SCH-I605, SCHI605TSV, and SCHI605ZWV — use the same battery bay dimensions and connector pinout, so one cell covers the full Verizon Note II lineup without modification.
• Bench tested on actual hardware: We cycled this cell on the SCH-I605 through charge, LTE streaming load, and deep discharge. The BMS held voltage above 3.4V under sustained screen-on load and triggered protection cutoff cleanly at the low-voltage threshold rather than allowing an uncontrolled shutdown.
• First-cycle fuel gauge reset: On first use, disable fast charging and run one complete discharge-charge cycle at standard current. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the SCH-I605 after a cell swap

The Note II's fuel gauge IC stores a learned discharge curve from the old cell. When a new cell goes in, the IC is still referencing that old curve. Under modem or display load, actual cell voltage can drop below the shutdown threshold while the gauge still reads 25%. The phone cuts out not because the cell is faulty but because the voltage cliff on the new cell lands at a different state of charge than the gauge expects. One full discharge to automatic cutoff followed by a complete charge resets the coulomb counter and removes this mismatch.

Phone won't power on after sitting in storage with a flat replacement cell

Li-ion cells in storage self-discharge slowly. If the cell drops below approximately 2.5V per cell, the BMS enters lockout mode and blocks charge current to prevent plating on the anode. The SCH-I605 will show nothing on screen when you press power. Connect the phone to a wall charger — not a USB port — and leave it untouched for 15–30 minutes. The charge IC will trickle current at a low rate until cell voltage rises above the BMS re-enable threshold, typically around 2.9V, at which point normal charging resumes.