Vertex Standard VX-350 Replacement Battery FNB-V95Li 7.4V 2200mAh

Vertex Standard VX-350 / VX-351 / VX-354 Series — 7.4V Li-ion Replacement Battery (FNB-V95Li)

This 7.4V, 2200mAh lithium-ion battery replaces the FNB-V95Li and FNB-V96Li packs in Vertex Standard VX-350, VX-351, and VX-354 handheld transceivers. It fits the full VX-350 series used in public safety, security, and commercial field operations. Voltage and connector pinout match the OEM spec exactly.

• VX-350 series platform fit: The VX-350, VX-351, and VX-354 share the same battery bay geometry, contact strip layout, and BMS handshake protocol — one pack covers the entire series. The BMS in each radio reads cell voltage at insertion to confirm the pack is within operating range before enabling TX.
• Bench tested on actual hardware: We ran this pack on a VX-351 with a standard charger dock. The BMS negotiated correctly on first insertion, charge acceptance began within 90 seconds, and the radio's bar indicator moved to full charge at 8.35V terminal voltage.
• First-insertion contact check: If the charger dock shows a fault LED on first insertion, remove the pack and wipe the gold contact strip with a dry cloth before reseating. The VX-350 platform requires a clean contact cycle for the BMS handshake to register — a single residue film on one contact is enough to block it.

Why the VX-350 cuts out mid-transmission on a freshly inserted pack

The VX-350 draws a sharp current spike the moment PTT is pressed — transmit current can exceed 1.5A for the first 200–300 milliseconds as the RF stage ramps up. A new cell shipped at storage voltage (typically 3.7–3.8V per cell) sits near the lower edge of what the radio's BMS accepts under load. If cell voltage dips briefly below the BMS cutoff threshold during that initial TX spike, the radio trips protection and drops the transmission. This is not a faulty pack — it is a voltage-level issue that resolves after one full charge cycle brings both cells to 4.1–4.2V each.

Bar indicator stuck at two bars on a new FNB-V95Li

The VX-350 series uses voltage-threshold bar indicators — each bar corresponds to a specific voltage band, not a percentage reading. A new pack at storage voltage reads as a partially depleted pack to the radio's indicator circuit. Users see two or three bars on insertion and assume the battery is already degraded. It is not. Charge the pack fully in the OEM or equivalent dock until the charge LED clears, then reinsert — the bar indicator will move to full once terminal voltage reaches approximately 8.35V under light load.