About this replacement
LG LX370 Slider Series — 3.7V Li-ion Replacement Battery (LGIP-430N)
This 3.7V 650mAh Li-ion cell replaces the LGIP-430N in the LG LX370, LX370 Slider, LX290, MT375, and related models. It restores power to devices that no longer hold a charge or fail to power on. Swap it when the original cell degrades and the phone becomes unreliable through a normal day.
- LX370 and LX290 platform fit: These models share the same battery bay geometry, contact pinout, and 3.7V single-cell architecture. The LGIP-430N connector seats and locks identically across the slider and candybar variants in this LG lineup.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on an LX370 unit. The BMS accepted charge immediately, terminated correctly at 4.2V, and held voltage across standby without anomalous drain.
- Fuel gauge recalibration on first use: On first installation, run the phone from 100% down to auto-shutdown without interruption, then charge uninterrupted to full. This gives the fuel gauge IC one complete cycle to map the new cell's discharge curve before the percentage readout becomes accurate.
Why the LX370 reports wrong battery percentage after a cell swap
The LX370 uses a fuel gauge IC that tracks charge state by coulomb counting against a stored cell profile. When a new cell goes in, the IC still references the old degraded curve. Until it records a full uninterrupted discharge-to-shutdown and full recharge, the percentage it displays is calculated against the wrong baseline. One complete cycle resets that reference point and the percentage readout stabilises.
Sudden shutdown at 20–30% on the replacement cell
This happens when the fuel gauge IC has not yet recalibrated to the new cell's voltage curve. The phone reads 25% remaining but the cell voltage under screen or modem load drops below the shutdown threshold before the gauge catches up. It is not a faulty cell — it is a calibration gap. Run one full uninterrupted discharge cycle and the cutoff point will align correctly with the displayed percentage.