LGIP-340NV Replacement Battery for LG GM750 3.7V 1100mAh

LG GM750 / Layla / Eigen / Octane — 3.7V Li-ion Replacement Battery (LGIP-340NV)

This is a 3.7V, 1100mAh Li-ion replacement battery for the LG GM750, Layla, Eigen, and Octane smartphones. It matches the LGIP-340NV form factor and slots directly into the rear battery compartment. The cell meets the voltage and connector spec the GM750 charging IC expects.

• GM750, Layla, Eigen, and Octane compatibility: These four models share the same 3.7V battery bay, LGIP-340NV connector pinout, and BMS handshake protocol — one cell covers all four without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the GM750. The BMS accepted the charge handshake without fault, and the protection circuit tripped correctly at low-voltage threshold during discharge testing.
• Fuel gauge recalibration on first cycle: On first use after installation, run the battery down to automatic shutdown, then charge uninterrupted to 100% before normal use. The GM750's fuel gauge IC was calibrated to your old cell's discharge curve — one complete cycle resets it against the new cell so percentage readings stay accurate.

Why the GM750 reports wrong battery percentage after a cell swap

The GM750 uses a coulomb counter IC that tracks charge state relative to a stored discharge curve from the original cell. When you install a fresh cell, the IC still references the old degraded curve. This causes the displayed percentage to read higher or lower than the actual charge state until the IC recalibrates. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the reference curve against the new cell. After that cycle, percentage readings stabilise.

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 discharge curve and misreads the voltage cliff. The GM750's modem and display together pull enough current that a slightly discharged cell drops below the BMS cutoff voltage under load — even when the screen shows 25% remaining. The phone cuts out to protect the cell, not because capacity is low. Complete the first full calibration cycle described above, and the shutdowns stop once the IC maps the correct voltage-to-percentage relationship for the new cell.