EB555157VA AT&T SGH-i997 Replacement Battery 3.7V 1400mAh

AT&T SGH-i997 Infuse 4G — 3.7V Li-ion Replacement Battery (EB555157VA)

This 3.7V, 1400mAh Li-ion cell replaces the original EB555157VA battery in the Samsung Infuse 4G (SGH-i997). It fits the SGH-i997, Infuse, and Galaxy S II Skyrocket. The cell matches the original connector, contact layout, and BMS handshake requirements for these models.

• SGH-i997 / Infuse 4G / Galaxy S II Skyrocket platform: These three models share the same battery bay dimensions, 3.7V voltage rail, and EB555157VA contact pinout. The BMS on each expects the same charge termination and protection thresholds, so one cell covers all three without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SGH-i997. The BMS accepted charge termination at 4.2V, triggered low-voltage cutoff correctly, and did not throw any protection faults during high-draw screen-on load cycles.
• Fuel gauge recalibration on first use: On first installation, disable fast charging and run one complete discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC one full reference cycle against the new cell's discharge curve before normal use resumes.

Sudden shutdown at 20–30% on the Infuse 4G after a cell swap

The SGH-i997 uses a coulomb-counter fuel gauge IC that was calibrated to the old cell's internal resistance profile. A new cell has lower impedance, so the voltage curve the phone expects does not match what the new cell delivers under modem and display load. When the 4G LTE radio fires a high-current burst, the cell voltage briefly sags below the IC's cutoff threshold even though the true state of charge is higher. The fix is one full uninterrupted discharge-to-shutdown cycle followed by a full charge — this resets the coulomb counter's reference endpoints to the new cell.

Phone shows erratic percentage jumps after installing the replacement cell

Percentage jumping — typically 40% to 55% or dropping 10% in seconds — happens when the fuel gauge IC has no valid calibration data for the new cell's discharge curve. The IC is guessing state of charge from a table built on the old, degraded cell. This is not a fault with the replacement cell itself. Run one complete discharge to automatic shutdown at normal screen brightness, then charge to 100% without interruption, and the gauge will lock onto the correct curve — jumps stop after that cycle.