Hytera HP505 Replacement Battery BP3005 7.7V 3600mAh

Hytera HP505 / HP565 — 7.7V Li-ion Replacement Battery (BP3005)

The BP3005 is a 7.7V, 3600mAh lithium-ion battery pack for the Hytera HP505 and HP565 portable digital radios. These are professional-grade land mobile radios used in public safety, security, and enterprise communications. The BP3005 slots directly into the battery bay and connects via the standard Hytera multi-pin contact strip.

• HP505 and HP565 platform fit: Both radios run off the same 7.7V power rail and share an identical battery bay geometry and BMS handshake protocol. The same physical pack and contact configuration covers both models without modification.
• Bench tested on actual hardware: We cycled this pack through full charge and PTT-load discharge on the HP505. The BMS handled repeated transmit-current spikes without tripping into overcurrent lockout, and the pack settled at rated capacity after two full cycles.
• First insertion into the Hytera charger dock: If the dock shows a fault LED on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Hytera dock requires a clean contact cycle to complete the BMS handshake before it will begin charging.

Why the HP505 cuts out mid-transmission on a new BP3005

When the HP505 keys up to transmit, current draw spikes sharply — often 2–3× the standby draw. A new cell sitting at storage voltage (typically around 3.7–3.8V per cell) has higher internal impedance than a fully conditioned cell. That impedance causes a voltage sag under the transmit load, which the radio's undervoltage protection reads as a low-battery condition and responds by cutting TX. Running two full charge-discharge cycles brings cell impedance down and resolves the cutout.

Bar indicator showing one fewer bar than expected on a fresh BP3005

The HP505 uses a simple voltage-threshold bar indicator — each bar maps to a voltage window, not a fuel gauge chip. A new pack shipped at storage voltage sits just below the threshold for the top bar, so the radio displays one bar short even though the cell is not depleted. Charge the pack fully in the Hytera dock until the charge LED goes solid green, then power on the radio. The indicator will read the correct full-charge voltage and display all bars.