Samsung Galaxy S Infuse 4G EB555157VA Replacement Battery 3.7V

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

This is a 3.7V, 1400mAh Li-ion replacement battery for the Samsung SGH-i997 Infuse 4G and related variants including the SGH-i757 and SGH-I757M. It replaces OEM part EB555157VA directly. When the original cell degrades and the phone can no longer hold a charge through a full day of use, this is the direct swap.

• SGH-i997 and SGH-i757 platform fit: These models share the same 3.7V single-cell Li-ion architecture, physical form factor, and connector orientation. The battery seats and contacts identically across the listed variants — no adapters or modifications needed.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SGH-i997 platform. The BMS communicated correctly with the charge IC, accepted current without tripping protection, and the phone recognised the battery at boot without error flags.
• Fuel gauge recalibration on first install: After fitting this cell, run one full discharge down to automatic shutdown, then charge uninterrupted to 100% before use. The Infuse 4G's fuel gauge IC calibrated to the old cell's discharge curve — skipping this step causes the percentage counter to read inaccurately from the first charge.

Sudden shutdown at 20–30% on the SGH-i997 after a cell swap

This happens because the fuel gauge IC still holds the discharge curve data from the degraded original cell. When the new cell's actual voltage drops under modem transmit load or screen brightness spikes, the phone's power management reads a false state-of-charge and triggers an emergency cutoff. The displayed percentage and the real cell voltage no longer match. One complete discharge-to-shutdown followed by a full uninterrupted charge cycle forces the coulomb counter to rebuild its reference map against the new cell. After that cycle, shutdowns at false-low percentages stop.

Phone warm near the battery slot during the first few charge cycles

A new Li-ion cell has slightly higher internal impedance than a broken-in cell. During the first two or three charge cycles, the charge IC pushes current into that higher impedance, and the difference dissipates as heat. This is normal and diminishes as the cell cycles. If the phone stays warm past the fourth charge cycle or becomes hot to the touch, check that no background sync processes are running during charging — sustained modem activity on top of charging current compounds heat on the SGH-i997's combined charge/radio board. By the third cycle, surface temperature should settle to warm, not hot.