EB575152VU Replacement Battery for T-Mobile Vibrant 3.7V 1550mAh

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

This is a 3.7V, 1550mAh Li-ion cell built to fit the T-Mobile Samsung Galaxy Vibrant, Galaxy S 4G, Vibrant 4G, and SGH-T959V. It slots into the original battery bay and connects to the same three-pin contact strip the phone's charge IC expects. Rated at 5.74Wh, it matches the stock capacity spec exactly.

• Vibrant / Galaxy S 4G platform fit: These models share the same chassis width, battery bay depth, and three-contact BMS handshake. The EB575152VU and its variants — EB575152VA, EB575152LU, EB575152LA — all use the same connector orientation and NTC thermistor pin, so the charge IC sees a valid cell on first boot.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a Galaxy S 4G. The BMS negotiated correctly with the charge IC, the NTC thermistor reported within normal range, and the protection circuit tripped cleanly at the low-voltage cutoff floor — no false positives under screen-on load.
• Fuel gauge recalibration on first install: After swapping in this cell, disable fast charging and run one complete discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the phone's coulomb counter a clean reference cycle against the new cell's actual discharge curve before it starts reporting percentage to the OS.

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

This happens because the phone's fuel gauge IC is still running the discharge curve it mapped to the old, degraded cell. When the new cell hits a voltage point the old curve treated as near-empty, the OS calls a shutdown — even though real capacity remains. The fix is one full uninterrupted discharge-to-shutdown followed by a full charge. After that cycle, the coulomb counter remaps to the new cell and the 20–30% cliff disappears. If it persists past two cycles, check that the battery contacts are clean and seating flush — a high-resistance contact connection causes the same voltage sag under modem load.

Phone shows erratic or jumping percentage in the first day after installation

The Galaxy Vibrant's fuel gauge IC uses a stored charge table calibrated to the original cell. A fresh replacement cell has a different internal resistance profile, so early percentage readings will skip or jump as the IC tries to match real-time voltage readings to a table that no longer fits. This is not a faulty battery — it is a calibration mismatch. Run the phone down to 0% shutdown, then charge straight to 100% without interruption. After that single full cycle, percentage reporting stabilises because the IC has a clean data point at both ends of the cell's actual voltage range.