About this replacement
LG VX4600 / VX4600B — 3.7V Li-ion Replacement Battery (LGLI-ADGM)
This is a 3.7V, 1000mAh Li-ion cell built to replace the original battery in the LG VX4600 and VX4600B handsets. It fits the VX-4600 and VX-4600B variants as well. Capacity figure is taken directly from product specification — 3.7Wh total energy.
- VX4600 series compatibility: The VX4600, VX4600B, VX-4600, and VX-4600B all share the same battery bay dimensions, contact layout, and 3.7V nominal voltage rail. One cell fits the entire variant group with no modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the VX4600 platform. The BMS accepted charge from the handset's onboard charge IC without fault flags, and voltage held stable across the standard load profile of the device.
- Fuel gauge recalibration on first use: After fitting this cell, run one complete discharge down to automatic shutoff, then charge uninterrupted to 100% before normal use. The VX4600's fuel gauge IC was calibrated to the original cell's discharge curve — skipping this step causes the percentage indicator to read inaccurately until the IC re-maps to the new cell.
Why the VX4600 reports wrong battery percentage after a cell swap
The VX4600 uses a fuel gauge IC that tracks charge state by mapping voltage against a stored discharge curve from the original cell. A new cell has a slightly different internal resistance and discharge profile, so the stored curve no longer matches what the IC is measuring. The IC compensates by interpolating, which produces percentage jumps or an early shutoff warning. One full discharge-to-shutoff followed by an uninterrupted full charge forces the IC to re-learn the new curve and restore accurate reporting.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops below the modem's minimum operating threshold under load — even though the fuel gauge still reads 20–30%. A fresh Li-ion cell has a steeper voltage cliff near the bottom of its discharge curve than an aged cell, so the handset cuts out before the percentage reaches zero. The fuel gauge IC hasn't yet mapped where that voltage cliff sits on the new cell. After the first full calibration cycle, the IC identifies the real cutoff point and the phone shuts down closer to 5–10% as expected.