LG LX5400 Replacement Battery 3.7V 1000mAh LGLI-ADYM

LG LX5400 / VI5225 — 3.7V Li-ion Replacement Battery (LGLI-ADYM)

This is a 3.7V, 1000mAh Li-ion replacement battery for the LG LX5400 flip phone and compatible models including the VI5225, 5400A, and LX-5400. It carries OEM part number LGLI-ADYM and slots directly into the battery bay on these handsets. Capacity figures are taken from our product data — 3.7Wh total.

• LX5400 series compatibility: The LX5400, VI5225, 5400A, and LX-5400 share the same battery footprint, connector pinout, and BMS communication protocol. One cell fits the group because LG used the same platform across these mid-2000s flip variants.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the LX5400 platform. The BMS handshake completed without fault codes, charge termination triggered correctly at 4.2V, and cutoff engaged at the low-voltage threshold without forced shutdown errors.
• Fuel gauge recalibration on first use: After installing this cell, run one complete discharge down to automatic shutdown, then charge uninterrupted to 100% before normal use. The phone's fuel gauge IC calibrated to the old cell's discharge curve — skipping this step leaves it reading against the wrong reference, causing erratic percentage reporting from day one.

Sudden shutdown at 20–30% on the LX5400 after a cell swap

The LX5400's charge IC reads state-of-charge using a coulomb counter calibrated to the original cell's internal resistance profile. A new cell has lower impedance, so the voltage-to-capacity curve shifts. When the display shows 25%, the actual cell voltage under screen or call load drops faster than the IC predicts, crossing the hardware cutoff threshold before the gauge catches up. This is not a defective battery — it is a calibration gap. Run one full discharge-to-shutdown cycle followed by an uninterrupted charge to 4.2V, and the fuel gauge recalibrates against the new cell's actual curve.

Phone warm near the battery compartment on first charge after installation

A new Li-ion cell arrives from storage with higher internal impedance than a cell that has been cycled. On the first charge cycle, the charge IC pushes current into a higher-resistance load than expected, and the excess energy dissipates as heat in both the cell and the charge circuitry. This is normal and typically resolves after the first two full cycles as impedance drops. If the handset stays warm beyond the second full charge, check that the battery contacts are fully seated — a partial connection increases resistance further and prolongs the heating window.