Kirisun DP480 Compatible Battery KB-75 7.4V 2000mAh

Kirisun DP480 / DP580 Series — 7.4V Li-ion Replacement Battery (KB-75)

This 7.4V, 2000mAh Li-ion battery replaces the Kirisun KB-75 and KB-75A packs. It fits the DP480, DP580, DP585, and DP586 two-way radios — a range of portable land mobile radios used in security, logistics, and emergency services. Voltage and capacity match the OEM specification exactly.

• DP480 / DP580 platform fit: The DP480 and DP580 series share the same battery bay dimensions, contact layout, and BMS handshake protocol. One pack covers all four models because Kirisun kept the same voltage rail and connector across the range — no adapters or modifications needed.
• Bench tested on actual hardware: We ran this pack through a full charge and discharge cycle on a DP480 unit. The BMS negotiated the handshake with the radio's charging circuit on first insertion, current draw during PTT press stayed within the expected transmit spike range, and the dock accepted the pack without fault.
• First insertion contact check: If the charger dock shows a fault LED on first insertion, remove the battery and wipe the gold contact strip with a dry cloth before reseating. The DP480 dock requires a clean contact cycle to accept the new BMS handshake — one firm re-insertion after cleaning typically clears it.

Why the DP480 cuts out mid-transmission on a new KB-75 pack

The DP480 draws a sharp current spike the moment PTT is pressed — RF output demands more current in that instant than the radio draws at standby. A new cell shipped at storage voltage (typically around 3.7V per cell) has higher internal impedance than a fully charged cell. If the pack hasn't completed its first full charge cycle, that impedance can cause a voltage sag large enough to trigger the radio's undervoltage cutoff mid-transmission. Charge the pack fully to 8.4V before the first use shift to bring cell impedance down to operating levels.

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

The DP480 uses a voltage-threshold bar indicator — each bar corresponds to a voltage window, not a fuel gauge reading. New cells arrive at storage voltage, typically 3.6–3.75V per cell, which sits below the top voltage window the radio expects at full charge. The display will show one or two bars even though the pack isn't faulty. Run one full charge cycle in the dock until the LED goes green, then reinsert — the indicator should read at the top bar threshold of 8.4V.