Yaesu VX-2 FNB-82LI Replacement Battery 3.7V 1050mAh

Yaesu VX-2 / VX-2R Series — 3.7V Li-ion Replacement Battery (FNB-82LI)

This is a 3.7V 1050mAh Li-ion replacement for the Yaesu FNB-82LI battery. It fits the VX-2, VX-2E, VX-2R, and VX-1 compact handheld transceivers. The cell matches the original voltage rail and physical footprint of the OEM pack.

• VX-2 series compatibility: The VX-2, VX-2E, and VX-2R share the same battery bay, contact layout, and 3.7V single-cell architecture. The VX-1 uses the same form factor. One pack fits all of these without modification.
• Bench tested on actual hardware: We ran this pack through charge and transmit cycles on a VX-2R. The BMS held steady under PTT-triggered current spikes and returned to normal float voltage cleanly after each transmission burst.
• First insertion on the VX-2 desk charger: If the charger LED flashes fault on first insertion, remove the pack, wipe the gold contacts on both battery and dock with a dry cloth, then reseat firmly. The VX-2 charger requires a clean contact cycle to handshake with the new BMS before it will begin charging.

Why the VX-2R cuts out mid-transmission on a fresh pack

A new Li-ion cell ships at storage voltage — typically 3.6–3.75V — not a full charge. When you key up on the VX-2R, transmit current can spike above 1A. If the cell is at storage voltage, the BMS may interpret that current draw as an overcurrent event and trip the output. The radio goes silent mid-PTT, then recovers when you release the key. Run at least one full charge cycle before transmitting — this raises cell voltage above the BMS overcurrent threshold and the behaviour stops.

Bar indicator showing one fewer bar than expected after a full charge

The VX-2 uses a voltage-threshold bar display, not a fuel gauge chip. Each bar corresponds to a voltage band, and a new cell may settle slightly below the top band within the first hour off the charger as surface charge dissipates. This is not a capacity fault. Key the radio once to draw a small load, then check the display again — resting voltage stabilises around 4.1–4.15V after that initial drop and the indicator will reflect the correct charge level.