Samsung Galaxy S II T769 Replacement Battery 3.7V 1750mAh

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

This 3.7V 1750mAh Li-ion cell replaces the original battery in the T-Mobile SGH-T769 and Galaxy S Blaze 4G smartphones. It restores power to the processor, display, modem, and wireless radios when the factory cell can no longer hold a usable charge. Capacity is 1750mAh (6.48Wh), matching OEM part numbers EB-L1G5HBA, EB-L1G5HBABXAR, and EB-L1G5HVA.

• SGH-T769 and Galaxy S Blaze 4G fit: Both devices share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The 65 × 48 × 5mm cell seats flush and the three-pin contact aligns with the charge IC without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SGH-T769 platform. The BMS accepted charge current without interruption, and the protection circuit tripped correctly at low-voltage cutoff — no false shutdowns during the test sequence.
• Fuel gauge recalibration on first cycle: After installing this cell, disable fast charging and run one full discharge down to auto-off, then charge to 100% uninterrupted. The fuel gauge IC in the SGH-T769 is calibrated to the old cell's discharge curve — this single cycle resets the coulomb counter against the new cell before high-current charging begins.

Sudden shutdown at 20–30% on the SGH-T769 after a cell swap

The SGH-T769's Snapdragon S3 draws a sharp current spike when the modem switches between HSPA bands or when the display backlight ramps up. A new cell with an uncalibrated fuel gauge can show 25% remaining while the actual terminal voltage is already close to the BMS cutoff threshold. The phone interprets a voltage sag under that load as a hard undervoltage event and shuts down immediately. One full discharge-recharge cycle lets the coulomb counter map the new cell's actual voltage-to-capacity curve and eliminates most premature cutoffs.

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

Li-ion cells self-discharge during storage, and if the cell drops below approximately 2.5V per cell, the BMS enters lockout mode to prevent damage — the phone will show nothing when you press the power button. Connect the device to a wall charger, not a PC USB port, and leave it for 15–20 minutes before attempting to power on. A PC port may not deliver enough current to wake the BMS from lockout. Once the charge IC has pushed the cell above the recovery threshold (around 3.0V), the phone will boot normally.