Samsung EB555157VA Infuse 4G Replacement Battery 3.7V 1850mAh

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

This is a 3.7V, 1850mAh Li-ion replacement for the EB555157VA battery. It fits the Samsung SGH-i997 (Infuse 4G), SGH-i757, SGH-I757M, and three additional variants sharing the same battery footprint. The cell dimensions are 56.00 x 50.20 x 5.20mm — a direct physical match to the original compartment.

• SGH-i997 / i757 platform fit: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. One cell SKU covers the full group because the charge IC negotiation is identical across all listed variants.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SGH-i997 platform. The BMS accepted the charge IC handshake without triggering an authentication fault, and the coulomb counter initialised normally on the first full cycle.
• Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after fitting this cell. The fuel gauge IC on the i997 calibrates its discharge curve during that initial cycle — running fast charge into an uncalibrated cell can skew the percentage readings for the life of the battery.

Why the Infuse 4G shuts down suddenly at 20–30% after a cell swap

The SGH-i997 uses a coulomb counter that was calibrated against the original cell's discharge curve. A new cell has a steeper voltage drop near the lower end of its charge state. When the modem fires or the screen peaks in brightness, the instantaneous current draw pulls the cell voltage below the BMS cutoff threshold — even though the displayed percentage still reads 20–30%. The phone reads the voltage collapse as a fault and shuts down immediately. One full uninterrupted discharge-charge cycle resets the coulomb counter and aligns the percentage display to the new cell's actual curve.

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

Li-ion cells self-discharge at roughly 1–3% per month in storage. If the battery shipped or sat unused long enough to drop below 2.5V per cell, the BMS enters a protection lockout and blocks normal charging to prevent damage. The phone shows nothing — no boot screen, no charging animation. Connect the device to a wall charger rated at 5V/1A or higher and leave it for 20–30 minutes without pressing the power button. The charge IC will trickle current into the cell until it clears the 2.5V recovery threshold, at which point normal charging resumes.