Samsung EB484659YZ Replacement Battery 3.7V 1200mAh

Samsung SCH-i110 Illusion — 3.7V Li-ion Replacement Battery (EB484659YZ)

This is a 3.7V, 1200mAh Li-ion cell that fits the Samsung SCH-i110 and its Illusion variants. It replaces the original EB484659YZ when the factory cell no longer holds a usable charge. Physical dimensions are 58.80 × 45.50 × 5.00mm — confirm these against your current cell before installing.

• SCH-i110 and Illusion compatibility: Both the SCH-i110 and the Illusion i110 use the same 3.7V battery bay, contact layout, and BMS handshake — the EB484659YZ part number covers the full range without modification.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on an SCH-i110 unit. The BMS accepted charge from the device's onboard charge IC without tripping, and the fuel gauge registered cell voltage correctly at rest.
• First-cycle fuel gauge reset: After installing this cell, run one complete discharge to near-zero and then charge fully without interruption. The SCH-i110's fuel gauge IC calibrates against the discharge curve on that first full cycle — skipping it causes erratic percentage readings for days.

Why the SCH-i110 reports wrong battery percentage after a cell swap

The SCH-i110 stores discharge curve data in a coulomb counter that was calibrated to the original cell's impedance profile. When a new cell goes in, that stored curve no longer matches the physical cell. The fuel gauge IC reads voltage but maps it to the wrong capacity point, so it reports 60% when the cell is actually at 40%. One full discharge-charge cycle overwrites the reference data and brings the readout back into alignment.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under load — typically during a call or screen-on burst — before the fuel gauge catches up. A fresh Li-ion cell at 1200mAh has a steeper voltage cliff in the lower capacity band than a worn cell does. The SCH-i110's protection circuit cuts power the moment cell voltage dips below roughly 3.0V, even if the gauge still shows charge remaining. Let the cell complete two full discharge-charge cycles; the voltage sag under load stabilises as the cell's internal resistance settles.