Vertex Standard VX-260 Replacement Battery FNB-112Li 7.4V 2200mAh

Vertex Standard VX-260 / VX-261 Series — 7.4V Li-ion Replacement Battery (FNB-112Li)

This 7.4V, 2200mAh Li-ion pack replaces the FNB-112Li and FNB-113Li batteries used in Vertex Standard VX-260, VX-261, EVX-530, and EVX-531 handheld radios, plus eight additional models in the same platform family. It slots into the same battery bay and connects to the same contact strip as the original Vertex Standard pack. Capacity is 2200mAh (16.28Wh), matching OEM spec.

• VX-260 / EVX-530 platform fit: The VX-260, VX-261, EVX-530, and EVX-531 share the same battery bay geometry, contact pitch, and BMS handshake protocol. That common architecture is why a single pack covers all four models without any modification.
• Bench tested on actual hardware: We ran this pack in a VX-261 dock and on the radio itself. The BMS accepted the charger handshake on first insertion, stepped through the CC/CV charge curve cleanly, and held voltage within the expected window under simulated PTT load cycles.
• First-insertion contact check: If the dock shows a fault LED on first seating, remove the pack and wipe the gold contact strip with a dry cloth before reseating. The Vertex Standard platform requires a clean contact cycle to complete the BMS handshake and begin charging — a partial contact break during shipping is the usual cause.

Why the VX-260 cuts out mid-transmission on a freshly inserted battery

When a new Li-ion pack ships, cell voltage sits at storage level — typically around 3.7V per cell, or roughly 7.4V total. During PTT transmit, the VX-260 draws a surge of current to power the RF amplifier. If the BMS reads that current spike against a cell that hasn't been through a full charge cycle, it can trip the overcurrent threshold and cut power momentarily. This is a BMS protection event, not a faulty pack. Charge the battery fully to 8.4V before the first operational use and the cutout stops.

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

The VX-260 and EVX-530 use a simple voltage-threshold bar display — each bar corresponds to a voltage band, not a calibrated capacity reading. A new cell fresh off the charger can settle slightly below the top threshold within the first few minutes of standby, dropping the indicator by one bar. This is normal cell surface charge bleed, not a capacity problem. Key the radio for a short transmission, let it sit for two minutes, and the display stabilises at the correct level.