EB575152VU AT&T Captivate Replacement Battery 3.7V 1550mAh

AT&T Captivate / Galaxy S Series — 3.7V Li-ion Replacement Battery (EB575152VU)

This 3.7V, 1550mAh Li-ion cell replaces the original battery in the AT&T Captivate, Epic 4G, SGH-i897, and Galaxy S. It matches the OEM voltage rail and connector pinout for these Samsung-platform Android handsets. Capacity is rated at 5.74Wh and dimensions are 51.00 × 50.50 × 5.50mm.

• Galaxy S platform compatibility: The Captivate, Epic 4G, and SGH-i897 all run on Samsung's first-generation Galaxy S hardware. They share the same battery bay geometry, three-pin connector, and 3.7V nominal voltage rail — which is why one cell covers all three variants.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on Galaxy S hardware. The BMS accepted charge without fault codes, and protection circuitry tripped correctly at the low-voltage cutoff threshold during discharge testing.
• Fuel gauge recalibration on first use: On first installation, disable any fast-charge adapter and run one full discharge-to-charge cycle at standard current. This gives the phone's fuel gauge IC time to map the new cell's discharge curve before high-current charging begins on an uncalibrated coulomb counter.

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

This happens because the fuel gauge IC still holds calibration data from the old, degraded cell. When the new cell hits a voltage point the IC associates with a higher state of charge, the phone reads 25% — but the modem or screen draws a current spike the old calibration curve never anticipated. Voltage sags below the cutoff threshold and the phone shuts down before the percentage reaches zero. One full discharge cycle, draining to automatic shutdown and then charging uninterrupted to 100%, resets the coulomb counter against the new cell's actual curve.

Phone not powering on after the replacement battery sat in storage

Li-ion cells in storage self-discharge over time. If the cell dropped below approximately 2.5V, the BMS may have entered lockout mode to prevent damage from deep discharge. The phone will show no response to the power button and may not react to a charger immediately. Connect the phone to a wall adapter — not a USB port — and leave it for 20–30 minutes without pressing anything; the charge IC needs time to trickle current into the cell and bring it above the BMS re-enable threshold before the phone can boot.