Standard Horizon HX470S Replacement Battery 7.4V 1400mAh

Standard Horizon HX470S Series — 7.4V Li-ion Replacement Battery

This 7.4V, 1400mAh Li-ion pack replaces the original battery on the Standard Horizon HX470S, HX471, HX471S, and HX471SB handheld marine VHF radios. These are waterproof transceivers used for maritime communication on the water. Voltage and capacity match the OEM specification exactly.

• HX470S and HX471 series compatibility: These models share the same 7.4V nominal voltage rail, battery connector footprint, and BMS handshake protocol — that is why one pack covers all variants in this lineup.
• Bench tested on actual hardware: We ran this pack through PTT transmit cycles on the HX471S. The BMS managed the transmit current spike cleanly and held voltage within the radio's accepted operating window throughout sustained RF output.
• Marine contact care: Salt air accelerates oxidation on the battery contact strips. After any saltwater exposure, wipe the gold contacts with a dry cloth before reinserting — a corroded contact layer will cause the charger dock to show a fault LED even when the pack is fully functional.

Why the HX470S cuts out mid-transmission on a new battery

The HX470S draws a sharp current spike the moment PTT is pressed — the radio switches from receive standby to full RF output in milliseconds. A new cell shipped at storage voltage (typically around 3.7V per cell) has higher internal impedance than a fully charged cell, which causes a brief voltage sag under that spike. The BMS interprets this sag as an overcurrent event and trips the protection circuit. Charge the pack fully to 8.4V before the first transmit session to bring impedance down to operating levels.

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

The HX470S uses a simple voltage-threshold bar indicator — each bar corresponds to a fixed voltage step, not a calculated percentage. A new pack sitting at storage voltage will read one bar low compared to a pack just pulled off the charger. This is not a capacity fault. Charge the battery fully in the dock first, and the indicator will advance to its correct position once the resting voltage climbs above 8.2V.