Samsung SCH-R530 Compatible Battery 3.7V 1400mAh Li-ion

USCellular SCH-R530 / Galaxy S III — 3.7V Li-ion Replacement Battery

This 3.7V, 1400mAh Li-ion cell replaces the original battery in the Samsung SCH-R530, Galaxy S III, and Galaxy S III LTE. It fits the standard battery bay and connects via the OEM contact strip. Capacity is 1400mAh — use that figure for any runtime or charge-cycle planning.

• SCH-R530 and Galaxy S III platform fit: These models share the same battery bay dimensions, voltage rail, and contact layout. The BMS on each variant expects a 3.7V nominal cell with a 4.2V charge ceiling — this replacement cell meets both.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on an S III unit. The BMS accepted charge without fault codes, reached 4.2V at termination, and held voltage under screen-on and modem load without dropping below the cutoff threshold.
• Fuel gauge recalibration on first use: After installation, run one full discharge to roughly 5–10% before charging back to 100%. The Galaxy S III uses a coulomb counter that was calibrated to your old cell's discharge curve — one complete cycle lets it map the new cell accurately before the readings stabilise.

Sudden shutdown at 20–30% on the SCH-R530 after a cell swap

This is a voltage cliff problem, not a capacity problem. Under screen-on load combined with active modem traffic, the cell voltage drops faster than the fuel gauge expects at that state of charge. When voltage hits the BMS cutoff threshold — typically 3.0V per cell — the phone shuts down even though the gauge still showed charge remaining. The fix is one full discharge-charge cycle so the coulomb counter resets its internal model to the new cell's actual discharge curve. After that cycle, the percentage readout tracks real voltage much more closely.

Phone warm near the battery slot on the first few charges

A new Li-ion cell has slightly higher internal impedance than a broken-in cell. During the first two or three charge cycles, the charge IC pushes current into that higher-impedance cell, and some energy dissipates as heat in the battery bay area. This is normal and typically resolves by the third full charge cycle as impedance drops. If warmth persists beyond five cycles or the phone becomes hot to the touch, check that the battery contacts are seated flat — a misaligned contact increases resistance and amplifies heating. Normal operating temperature at the back cover should be below 40°C.