EB-L1G5HBA T-Mobile SGH-T769 Replacement Battery 3.7V 1500mAh

T-Mobile SGH-T769 Galaxy S Blaze 4G — 3.7V Li-ion Replacement Battery (EB-L1G5HBA)

This is a 3.7V, 1500mAh Li-ion battery built to fit the T-Mobile SGH-T769, also sold as the Samsung Galaxy S Blaze 4G. It replaces OEM part numbers EB-L1G5HBA, EB-L1G5HBABXAR, and EB-L1G5HVA. Dimensions are 65 × 48 × 5mm — an exact physical match for the stock battery bay.

• SGH-T769 and Galaxy S Blaze 4G fitment: Both devices share the same battery bay geometry, voltage rail, and connector pinout. The BMS handshake on this cell matches the charge IC in both variants, so the phone accepts the battery without error flags on startup.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SGH-T769 platform. The BMS held within the expected 3.0V–4.2V window, and the charge IC accepted the cell without tripping the protection circuit during load spikes from the modem.
• Fuel gauge recalibration on first cycle: After installation, run one full discharge down to automatic shutdown, then charge uninterrupted to 100% before use. The SGH-T769 fuel gauge IC holds the old cell's discharge curve in memory — skipping this step causes erratic percentage readings that persist across reboots.

Why the SGH-T769 reports wrong battery percentage after a cell swap

The SGH-T769 uses a coulomb counter inside the fuel gauge IC to estimate remaining charge. That counter was calibrated against the original cell's specific discharge curve. When a new cell goes in, the IC applies the old curve to a different cell chemistry profile, which throws the percentage readout off by 10–25%. One complete discharge-charge cycle gives the IC enough data points to rebuild an accurate curve for the new cell. Until that cycle completes, the percentage display should be treated as approximate.

Sudden shutdown at 15–25% remaining on the replacement cell

This happens when the modem or display pulls a high current burst and the cell voltage drops below the BMS cutoff threshold — even though the gauge still shows charge remaining. It is a voltage-sag issue, not a capacity issue. The new cell's internal resistance is slightly higher than a run-in cell, so voltage dips harder under load during the first few cycles. After 5–10 full cycles, internal resistance drops and the shutdowns stop. If they persist past 10 cycles, check that the battery contacts are clean and seated fully — dirty contacts add resistance and push the voltage sag further.