HYT TC-446S Compatible Battery BL1301 7.4V 1800mAh

HYT TC-446S / TC-580 Series — 7.4V Li-ion Replacement Battery (BL1301 / BL1719)

This is a 7.4V, 1800mAh Li-ion replacement battery for HYT two-way radios including the TC-446S, TC-518, TC-580, and TC-560. It uses OEM part numbers BL1301 and BL1719. The battery slots directly into the radio's battery compartment and connects via the standard HYT contact strip.

• TC-446S, TC-518, TC-580, TC-560 compatibility: These models share the same 7.4V power rail, identical battery footprint, and the same BMS handshake protocol — which is why a single pack covers the full group. The connector pinout and locking tab position are consistent across this HYT platform.
• Bench tested on actual hardware: We ran this pack on a TC-580 bench unit and cycled the BMS through transmit loads. The protection circuit responded correctly to overcurrent events on PTT press and recovered without fault. Cell voltage at rest settled at 7.6V after a full charge cycle.
• First insertion on the HYT charger dock: If the dock LED flashes fault on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The HYT charger requires a clean contact cycle to complete the BMS handshake before it begins charging.

TC-580 cuts out mid-transmission on a new BL1301 pack

A new Li-ion cell ships at storage voltage — typically 3.7–3.8V per cell, not full charge. When you key up on a fresh-out-of-box pack, the transmit current draw causes an immediate voltage sag that can trip the BMS undervoltage cutoff. The radio drops the transmission and may show a low-battery indicator even though the pack is new. Charge the battery fully before first use — the dock should show solid green before you put the radio into service.

Bar indicator shows one fewer bar than expected after a full charge

HYT radios read battery level from voltage thresholds only — there is no calibration to perform. A new cell's resting voltage after its first charge cycle sits slightly below the peak of a well-conditioned pack, which can push it one threshold bar lower. Run two full charge-discharge cycles and the resting voltage will stabilise. After the second cycle, recheck the bar indicator with the radio idle — it should read correctly at or above 7.8V open circuit.