EB575152VU T-Mobile Vibrant Compatible Battery 3.7V 1250mAh

T-Mobile Vibrant / Galaxy S 4G — 3.7V Li-ion Replacement Battery (EB575152VU)

This is a 3.7V, 1250mAh Li-ion battery for the T-Mobile Samsung Vibrant, SGH-T959W, Galaxy S 4G, and Vibrant 4G. It replaces OEM part numbers EB575152VU, EB575152VA, and EB575152LA. If your original cell no longer holds a charge or the phone won't power on, this is the direct swap.

• Vibrant and Galaxy S 4G platform fit: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers all variants on this platform without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Vibrant unit. The BMS communicated correctly with the phone's fuel gauge IC, and charge termination triggered at the expected 4.2V ceiling with no false cutoff.
• Fuel gauge recalibration on first use: After installation, run one full discharge to automatic shutdown, then charge to 100% without interruption. The Vibrant's fuel gauge IC needs this cycle to map the new cell's discharge curve — skipping it causes the percentage counter to read inaccurately from the first day.

Sudden shutdown at 20–30% on the Vibrant after a cell swap

The Vibrant's PMIC uses voltage thresholds from the previous cell's discharge curve to decide when to shut down. A new cell has a steeper voltage drop near depletion than an aged cell, so the phone hits its low-voltage cutoff while the display still shows 20–30% remaining. This is a fuel gauge calibration mismatch, not a defective battery. Run one complete discharge-to-shutdown, then a full uninterrupted charge. After that cycle, the coulomb counter recalibrates and the reported percentage lines up with actual remaining capacity.

Phone warm near the battery compartment during the first charge

A new high-impedance cell draws charge current against elevated internal resistance, which generates more heat than a broken-in cell. On the Vibrant, the charge IC doesn't throttle current on first insertion — it pushes the full charge profile immediately. This is normal for the first one or two cycles and settles as internal resistance drops. If the back cover stays hot after two full charge cycles, check that the cell is seated flat with no gap along the connector edge, as poor contact increases resistance further.