Yaesu FT-60 FNB-57 Replacement Battery 7.4V 2200mAh

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

This 7.4V 2200mAh Li-ion pack replaces the FNB-57 and seven compatible OEM part numbers for the Yaesu FT-60 and FT-60R handheld transceivers. It fits the full FT-60 platform — the same connector, voltage rail, and BMS handshake across all variants. Capacity listed is from the product specification: 2200mAh (16.28Wh).

• FT-60 / FT-60R platform fit: The FT-60 and FT-60R share the same battery bay geometry, contact strip layout, and 7.4V supply rail. All variants listed accept this pack without modification — the BMS handshake is the same across FNB-57, FNB-64, FNB-83, FNB-V57, and FNB-V67Li replacements.
• Bench tested on actual hardware: We ran this pack through transmit-cycle loads on the FT-60 platform. The BMS handled the PTT current spike cleanly, with no premature cutoff under sustained VHF output. Voltage held stable through the mid-cycle range where degraded original cells typically sag.
• First insertion into the FT-60 charger dock: If the dock LED blinks fault on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The FT-60 dock reads the BMS before accepting charge — a marginal contact on the first cycle is the most common cause of a false fault indication.

Why the FT-60 drops to low-power TX mid-shift on a fresh battery

The FT-60 steps down transmit power automatically when the battery voltage falls below the radio's internal threshold — typically around 6.8V under load. A new cell shipped at storage voltage (around 3.6–3.7V per cell) can trigger this behaviour on the first few transmit cycles before the pack settles. This is not a fault in the radio or the battery. Run two or three full charge cycles and the pack will deliver its rated capacity consistently under transmit load.

Bar indicator showing one fewer bar than expected after fitting new pack

The FT-60 uses a voltage-threshold bar indicator — it reads instantaneous pack voltage, not stored charge. A new cell at storage voltage reads lower than a fully charged cell, so the indicator may show one bar short immediately after fitting. Charge the pack fully in the dock before drawing any conclusions. After a complete charge, the indicator should read at the top threshold; if it still shows low, check dock contact seating and verify the charge LED moved to steady green.