Hytera TC-700 BL-2608 Replacement Battery 7.4V 3350mAh

Hytera TC-700 Series — 7.4V Li-ion Replacement Battery (BL-2608)

The BL-2608 is a 7.4V, 3350mAh Li-ion battery that fits the Hytera TC-700, TC-700U, TC-780, TC-780M, and TC-710 portable two-way radios. These are professional-grade land mobile radios used in security, public safety, and enterprise communications. This battery slots directly into the same bay as the original BL-2608 and connects via the same contact strip.

• TC-700 and TC-780 platform compatibility: The TC-700, TC-700U, TC-780, TC-780M, and TC-710 all share the same battery bay geometry, contact pin layout, and 7.4V nominal voltage rail. The BMS in each radio reads cell voltage through the same three-pin interface, so one battery pack works across the full series without modification.
• Bench tested on actual hardware: We cycled this pack on a TC-700 unit through repeated PTT transmit loads. The BMS held the protection threshold steady through sustained RF output bursts and correctly tripped on simulated short-circuit conditions before resetting cleanly.
• First insertion into the Hytera charger dock: If the dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Hytera charging platform requires a clean contact cycle to complete the BMS handshake before it will begin charging.

Why the TC-700 drops to reduced TX power mid-shift on a new BL-2608

A new Li-ion cell ships at storage voltage — typically 3.7–3.8V per cell, not the full 4.2V. Under sustained RF output, the TC-700's power amplifier draws a heavy current spike. If the cell hasn't been fully charged first, voltage sags under that load and the radio's protection circuit steps down transmit power to stay within safe operating range. This isn't a faulty pack — it's the radio protecting itself from an undercharged cell. Charge the battery fully in the dock before first field use and the voltage sag disappears.

Bar indicator shows one fewer bar than expected after fitting a new BL-2608

The TC-700 uses a voltage-threshold bar indicator — each bar corresponds to a specific cell voltage window. A new pack at storage voltage sits at roughly 3.75V per cell, which maps to one or two bars below full on the display. The radio isn't misreading the pack — it's accurately reporting the current cell voltage. Place the battery in the dock, run a full charge cycle until the dock indicator goes green, and the bar indicator will read correctly at 4.1–4.2V per cell.