Vertex Standard FNB-57 FT-60 Compatible Battery 7.4V 2200mAh

Vertex Standard FT-60 / FT-60R Series — 7.4V Li-ion Replacement Battery (FNB-57)

This 7.4V, 2200mAh Li-ion battery replaces the FNB-57 and compatible packs in the Vertex Standard FT-60 and FT-60R handheld two-way radios. It also covers the FNB-64, FNB-83, FNB-V57, FNB-V67Li, FNB-V83, FNB-V94, and related variants under the same platform. Voltage and cell format match the original pack exactly.

• FT-60 platform compatibility: The FT-60, FT-60R, FT60, and FT60R share the same 7.4V voltage rail, battery connector pinout, and BMS handshake protocol — which is why one cell pack covers all variants. The radio's firmware reads pack voltage through the same contact points across the entire run of these models.
• Bench tested on actual hardware: We cycled this pack on an FT-60R dock and verified the BMS accepted the handshake on first insertion without a fault LED. Transmit current spikes during PTT press registered within spec — the BMS did not trip.
• 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 FT-60 platform requires a clean contact cycle to accept the new BMS handshake before charging begins.

Why the FT-60R cuts out mid-transmission on a new battery

The FT-60R draws a sharp current spike the moment PTT is pressed — RF output demands significantly more current than standby. If the replacement pack shipped at storage voltage (typically around 3.7V per cell), the BMS may interpret that spike as an overcurrent event and trip the protection circuit. This is not a faulty battery. Charge the pack fully before the first transmission-heavy use and the BMS will recalibrate its overcurrent threshold to normal operating conditions.

Bar indicator showing fewer bars than expected after inserting a new pack

The FT-60 uses a simple voltage-threshold bar indicator — it reads cell voltage directly and maps it to bar segments. A new pack at storage voltage (around 3.6–3.8V per cell) will display one or two bars even though the cell is not depleted. This is normal behaviour, not a capacity fault. Charge the battery to full (the dock LED turns green at approximately 8.4V pack voltage) and the bar display will read correctly from the first use.