Samsung SCH-N330 Compatible Battery 3.7V 850mAh BEX274DKRB

Samsung SCH-N330 — 3.7V Li-ion Replacement Battery (BEX274DKRB)

This is a 3.7V, 850mAh (3.15Wh) lithium-ion battery for the Samsung SCH-N330 mobile phone. It replaces OEM part number BEX274DKRB when the original cell degrades, loses capacity, or fails to hold a charge. Fit is direct — same voltage, same connector, same form factor as the factory unit.

• SCH-N330 platform fit: The SCH-N330 uses a single-cell 3.7V Li-ion pack with a specific connector pinout and BMS handshake tied to the phone's charge IC. This replacement matches that electrical profile, so the phone's charge controller recognises the pack and begins the CC/CV charge sequence normally.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a compatible Samsung platform. The BMS accepted charge without fault, held voltage above 3.5V through the majority of the discharge curve, and triggered protection cutoff cleanly at the low-voltage threshold — no unexpected shutdowns during testing.
• Fuel gauge recalibration on first install: On first use, disable any fast-charge mode and run one complete discharge-to-charge cycle. The phone's fuel gauge IC was calibrated to the old cell's discharge curve. One full cycle against the new cell lets the coulomb counter reset its endpoints before high-current charging pushes current into an uncalibrated state.

Why the SCH-N330 reports wrong battery percentage after a cell swap

The phone stores a discharge curve profile in its fuel gauge IC, built up over hundreds of cycles on the original cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry and impedance. The percentage readout drifts — often reading 100% before the cell is actually full, or dropping suddenly in the lower range. One full discharge down to auto-shutdown, followed by a full uninterrupted charge, forces the fuel gauge to relearn the new cell's endpoints and corrects the readout.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens when the cell voltage drops below the phone's minimum threshold under load — typically during screen-on use or a data burst — even though the reported percentage looks safe. A fresh cell with an uncalibrated fuel gauge can report 25% while the actual resting voltage is already near 3.5V. Under a brief load spike, voltage sags past the protection cutoff and the phone shuts off. Run the phone down to auto-shutdown once, then charge to 100% without interruption — after that cycle the fuel gauge maps the voltage cliff accurately and the premature shutdowns stop.