Samsung SCH-I400 Replacement Battery EB124465YZ 3.7V 2400mAh

Samsung SCH-I400 Continuum — 3.7V Li-ion Replacement Battery (EB124465YZ)

This is a 3.7V, 2400mAh Li-ion cell replacing the EB124465YZ in the Samsung SCH-I400 Continuum. It fits the i400 Continuum and Galaxy S i400 variants. Voltage and connector match the original spec exactly.

• SCH-I400 Continuum platform fit: The i400 Continuum runs a dual-display layout — a standard AMOLED panel above and a Ticker strip below. Both draw from the same 3.7V rail through a single BMS connector. This cell uses the same contact layout and BMS handshake as the original EB124465YZ, so the phone's charge IC recognises it without triggering a fault state.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SCH-I400 platform. The BMS accepted the cell without entering protection mode, the charge IC held the correct taper current at end-of-charge, and the fuel gauge did not throw an error on the first full cycle.
• Fuel gauge recalibration on first use: After installing this cell, disable fast charging for one complete discharge-charge cycle. The fuel gauge IC on the i400 is calibrated to the original cell's discharge curve. Running one slow cycle first lets the coulomb counter re-anchor to the new cell before resuming normal charging current.

Why the SCH-I400 reports wrong battery percentage after a cell swap

The i400 uses a fuel gauge IC that tracks charge state by comparing measured voltage and current against a stored discharge curve from the original cell. When you fit a new cell, that stored curve no longer matches the actual discharge characteristics of the replacement. The gauge reads voltage correctly but miscalculates state of charge against the old reference. One complete slow discharge down to auto-off, followed by a full uninterrupted charge, forces the IC to rewrite its reference endpoints. After that cycle, percentage readings stabilise.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display pulls a short burst of high current and the cell voltage dips below the BMS cutoff threshold — even though the fuel gauge still shows charge remaining. On a new cell that has not been conditioned, internal impedance is slightly higher than a broken-in cell, which amplifies the voltage sag under load. The BMS interprets the sag as a low-cell fault and shuts the phone down. Run two to three full discharge-charge cycles to bring impedance down; if shutdowns persist past cycle three, check that the cell resting voltage sits above 3.6V after a full charge.