Verizon SCH-i920 Replacement Battery 3.7V 3200mAh

Verizon SCH-i920 Omnia II — 3.7V Li-ion Replacement Battery (AB944757GZ)

This is a 3.7V, 3200mAh Li-ion replacement battery for the Verizon Samsung SCH-i920 Omnia II smartphone. It fits the SCH-i920, SCH-i920V, and SCH-i920 Omnia II variants. Install it when the original cell no longer holds a charge or causes unexpected shutdowns.

• SCH-i920 and SCH-i920V compatibility: Both variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol — this cell covers all three model designations without modification.
• Bench tested on actual hardware: We cycled this battery through full charge and discharge on the SCH-i920 platform. The BMS communicated correctly with the charge IC, and protection circuits tripped at expected voltage thresholds during load testing.
• Fuel gauge recalibration on first install: After swapping this cell in, disable fast charging and run one complete discharge-to-charge cycle before normal use. The fuel gauge IC on the Omnia II is calibrated to the original cell's discharge curve — one full cycle lets it remap against the new cell before high-current charging begins.

Sudden shutdown at 20–30% on the SCH-i920 after a cell swap

This happens because the fuel gauge IC still holds the discharge curve of the old, degraded cell. When the new cell's voltage drops under modem or display load, the gauge miscalculates the remaining capacity and the phone shuts down before it registers zero. The coulomb counter needs real-world load data from the new cell to reset its internal model. Run two full discharge-charge cycles without fast charging and the shutdowns will stop as the gauge relearns the voltage curve.

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

Li-ion cells self-discharge in storage, and if the voltage dropped below 2.5V per cell, the BMS has likely tripped into deep-discharge lockout to prevent damage. The phone will not respond to the power button because the BMS is blocking current to the system. Connect the phone to a wall charger — not a USB port — and leave it for at least 20 minutes without pressing anything. Once the BMS detects the cell voltage has recovered above approximately 2.8V, it will release the lockout and the charge indicator will appear.