LGIP-520NV Verizon UN150 Envoy Compatible Battery 3.7V 800mAh

Verizon UN150 Envoy / VN150 Revere — 3.7V Li-ion Replacement Battery (LGIP-520NV)

This is a 3.7V, 800mAh Li-ion replacement cell for the Verizon UN150 Envoy and VN150 Revere. It fits the same connector and battery bay as the original LGIP-520NV. Capacity is 800mAh (2.96Wh) — matching the factory spec for these handsets.

• UN150 / VN150 platform compatibility: The UN150 Envoy, VN150 Revere, and LG-VN150PP variants share the same 3.7V single-cell architecture, battery bay dimensions (49.00 × 34.20 × 5.80mm), and connector pinout. One cell covers the full group.
• Bench tested on actual hardware: We cycled this cell on a VN150 Revere. The BMS accepted charge from the device's internal charge IC without interruption, and the protection circuit tripped correctly at the low-voltage cutoff threshold under a simulated load drain.
• Fuel gauge recalibration after swap: On first use after installation, run the phone down to automatic shutdown on a single discharge, then charge to 100% uninterrupted. This gives the fuel gauge IC one full reference cycle against the new cell's discharge curve before normal use.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff problem. The fuel gauge IC in the UN150 and VN150 was calibrated against the old, degraded cell — its voltage-to-percentage map no longer matches the new cell's discharge curve. Under load from the screen or a call, the cell voltage drops faster than the gauge predicts, hitting the hardware cutoff before the display percentage reaches zero. The fix is one full uninterrupted discharge-to-shutdown followed by a full charge. After that cycle, the coulomb counter has a clean reference and shutdowns at low percentage stop.

Phone won't power on after sitting in storage with a new battery installed

Li-ion cells shipped and stored for extended periods can self-discharge below 2.5V per cell. At that voltage, the BMS enters lockout mode to prevent damage — the phone will show no response to the power button and no charge indicator when plugged in. Connect the phone to a wall charger and leave it undisturbed for 15–20 minutes without pressing anything. The charge IC trickle-charges the cell back above the BMS recovery threshold, typically around 2.9V, at which point the BMS unlocks and normal charging resumes.