EB-L1G5HBA Galaxy Exhilarate Replacement Battery 3.7V 1500mAh

AT&T Galaxy Exhilarate / SGH-I577 — 3.7V Li-ion Replacement Battery (EB-L1G5HBA)

This is a 3.7V 1500mAh Li-ion battery for the AT&T Galaxy Exhilarate, Galaxy Exhilarate 4G, and SGH-I577. It replaces OEM part numbers EB-L1G5HBA, EB-L1G5HBABXAR, and EB-L1G5HVA. Swap it when the original cell no longer holds a usable charge or swells from repeated charge cycles.

• Galaxy Exhilarate 4G and SGH-I577 fit: Both variants share the same battery bay dimensions (65 × 48 × 5mm), connector pinout, and BMS handshake voltage. One cell fits all three model numbers without any modification.
• Bench tested on actual hardware: We cycled the cell through full charge and load discharge on the SGH-I577 platform. The BMS responded correctly to charge termination at 4.2V and held low-voltage cutoff without tripping early under display and modem load.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Why the Galaxy Exhilarate shuts down suddenly at 20–30% after a cell swap

The phone's fuel gauge IC holds a discharge curve calibrated to the original cell. A new cell with a different internal resistance profile hits a voltage cliff earlier under combined modem and display load — the IC sees terminal voltage drop below its threshold and triggers shutdown before the percentage counter reaches zero. This is not a fault with the replacement cell. One full discharge cycle without fast charging allows the coulomb counter to resynchronise against the new cell's actual voltage curve. After that cycle, the shutdown-at-percentage behaviour typically resolves.

Phone warm near the battery compartment during first charge

A new Li-ion cell starts with higher internal impedance than a broken-in cell. The charge IC pushes current into that higher resistance, generating more heat in the first few cycles. This is normal and decreases as the cell completes two or three full cycles. If the back of the device stays warm beyond the first three cycles, check that the charge IC is not locked into a higher constant-current phase — verify charge termination by checking the status LED drops to trickle at 4.18–4.20V.