EB-L1G5HBA Samsung Galaxy Exhilarate Replacement Battery 3.7V

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

This is a 3.7V, 1750mAh Li-ion replacement battery for the Samsung Galaxy Exhilarate and Galaxy Exhilarate 4G on AT&T (model SGH-I577). It matches OEM part numbers EB-L1G5HBA, EB-L1G5HBABXAR, and EB-L1G5HVA. It slots into the original battery bay with no modification.

• Galaxy Exhilarate and Exhilarate 4G compatibility: Both variants use the same physical bay, connector pin layout, and BMS handshake protocol — one battery cell covers both. The SGH-I577 board reads charge state through the same three-contact thermistor line on either device.
• Bench tested on actual hardware: We ran this cell in an SGH-I577 unit and confirmed the BMS accepted the cell without fault flags. Charge acceptance was normal across the full 3.7V nominal range, and the protection circuit tripped correctly at low-voltage threshold.
• Fuel gauge recalibration after swap: On first use after installation, disable fast charging and run one full discharge-charge cycle. The fuel gauge IC on the Exhilarate calibrates its coulomb counter against the new cell's discharge curve — skipping this step causes the OS to report inaccurate percentages until it completes a full cycle naturally.

Why the Galaxy Exhilarate reports wrong battery percentage after a cell swap

The SGH-I577 uses a fuel gauge IC that tracks charge state by counting coulombs in and out of the cell. When the original cell ages, the IC recalibrates its full-charge reference to the degraded capacity. A new 1750mAh cell has a different discharge curve, so the stored reference is immediately out of sync. The phone reads remaining charge against the old curve and displays incorrect percentages — often showing 100% that drops sharply to 60% within minutes. One complete discharge to shutdown, then a full charge to 4.2V, resets the counter reference to match the new cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem radio or display spikes current demand and the cell voltage drops below the BMS cutoff threshold — even though the OS gauge still shows charge remaining. The fuel gauge IC has not yet mapped the new cell's voltage-sag profile under load. Until it does, the BMS trips the protection circuit at what appears to be a partially charged state. Run two full discharge-charge cycles without interruption and the gauge IC builds an accurate low-voltage cliff map. After that, shutdown should not occur above 3.4V under normal load.