Hytera BL1204 TC-610 Compatible Battery 7.4V 1200mAh

Hytera TC-610 / TC-618 / TC-620 Series — 7.4V Li-ion Replacement Battery (BL1204 / BL2001)

This is a 7.4V, 1200mAh lithium-ion battery that replaces the Hytera BL1204 and BL2001 packs. It fits the TC-610, TC-610P, TC-618, and TC-620 portable two-way radios. These radios are common in security, hospitality, and emergency services where a dead pack mid-shift is not an option.

• TC-610 series platform fit: The TC-610, TC-610P, TC-618, and TC-620 share the same battery bay geometry, contact pin layout, and 7.4V BMS handshake threshold — which is why a single pack covers all four models. Swapping between them does not require a new charger or dock reconfiguration.
• Bench tested on actual hardware: We cycled this pack through the Hytera TC-610 under simulated PTT load. The BMS handled transmit current spikes without tripping and held the voltage rail above the radio's low-battery cutoff throughout the discharge curve.
• First insertion into the charger dock: If the dock LED shows a fault or blinks on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The TC-610 charging dock requires a clean contact cycle to accept the BMS handshake before charging begins — a partial contact is the most common cause of a false fault read.

Why the TC-610 cuts out mid-transmission on a new BL1204 pack

The TC-610 draws a sharp current spike the moment PTT is pressed — RF output demands significantly more current than standby or receive modes. If the replacement pack ships at storage voltage (typically around 3.7V per cell), the BMS may read that spike as an overcurrent event and trip before the radio completes the transmission. This is not a faulty pack. Run the battery through one full charge before first use to bring both cells to a balanced voltage, and the BMS will handle the PTT surge cleanly on subsequent transmissions.

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

The TC-610 uses a simple voltage-threshold system to drive the bar indicator — it reads cell voltage and maps it to bars, not a fuel gauge chip. A new pack at storage voltage sits below the threshold the radio expects for a full charge, so the display shows one or two bars even though the pack is not depleted. Place the pack on the charger dock and run a full charge cycle. Once cell voltage reaches 8.4V, the radio will display the correct bar count.