Icom BP-283 Compatible Battery 7.4V 1900mAh Li-ion

Icom IC-F3400 Series — 7.4V Li-ion Replacement Battery (BP-283)

This 7.4V, 1900mAh Li-ion battery replaces the BP-283, BP-284, and BP-303 packs in Icom IC-F3400, IC-F3400D, IC-F3400DP, and IC-F3400DPS portable transceivers, along with 18 additional IC-F3400 series variants. It matches OEM voltage and capacity exactly. Swap is direct — same connector, same BMS handshake protocol.

• IC-F3400 series platform fit: All IC-F3400 variants share a common 7.4V power rail, locking latch connector, and BMS communication line. BP-283, BP-284, and BP-303 are all electrically interchangeable within this platform — Icom issued multiple part numbers across production runs, not separate designs.
• Bench tested on actual hardware: We cycled this pack through repeated PTT transmit loads on the IC-F3400 platform. The BMS handled the transmit current spike without triggering overcurrent cutoff, and the dock accepted the pack's BMS handshake on the first insertion cycle.
• First insertion on the dock: If the charger shows a fault LED on the first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The IC-F3400 dock requires a clean contact cycle to complete the BMS handshake before charging begins — a single wipe clears most first-charge faults.

IC-F3400 cuts out mid-transmission on a freshly inserted pack

The IC-F3400 draws a sharp current spike at the moment PTT is pressed — transmit current is significantly higher than receive or standby draw. If the replacement pack ships at storage voltage (typically around 3.7V per cell), the BMS may read an instantaneous voltage sag under that transmit load and trigger an overcurrent protection cutoff. The radio goes silent mid-key. This is not a faulty battery — it is the BMS acting correctly on a cell that hasn't reached nominal charge. Charge the pack to full before the first transmission test; 7.4V nominal on the dock indicator clears this entirely.

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

The IC-F3400 uses a voltage-threshold bar indicator — each bar corresponds to a voltage band, not a calculated state of charge. A new pack at storage voltage sits below the top threshold, so the radio displays three bars instead of four even though the cell is not depleted. This is normal for a pack that has not yet completed its first full charge. Place the pack in the dock and charge until the dock LED goes green. Once the pack reaches full voltage, the indicator will show the correct bar count on the next power cycle.