Hytera HP500 Replacement Battery BL1508 7.7V 2350mAh

Hytera HP500 / HP505 / HP560 / HP565 — 7.7V Li-ion Replacement Battery (BL1508)

This is a 7.7V, 2350mAh (18.1Wh) Li-ion replacement battery for the Hytera HP500 series portable two-way radios. It fits the HP500, HP505, HP560, and HP565 — all platforms that share the same battery bay dimensions and BMS handshake protocol. The OEM part numbers covered are BL1508, BL2301-Ex, and BP3005.

• HP500 series platform fit: The HP500, HP505, HP560, and HP565 share a common 7.7V battery rail, connector pinout, and BMS communication bus. One cell assembly serves all four models without modification.
• Bench tested on actual hardware: We cycled this pack on a HP500 unit and monitored BMS response through full PTT transmit bursts. The protection circuit handled the transmit current spike without triggering an overcurrent lockout, and the charger dock accepted the handshake on the first insertion.
• First-insertion contact check on the HP500 dock: If the dock shows a fault LED on first seating, remove the battery and wipe the gold contact strip with a dry cloth before reseating. The HP500 charging dock requires a clean contact cycle to complete the BMS handshake — a residue film is enough to block it.

Why the HP500 cuts out mid-transmission on a freshly inserted BL1508

A new Li-ion cell ships at storage voltage — typically around 3.7V to 3.8V per cell, not full charge. When the HP500 fires a PTT transmit burst, it draws a sharp current spike that the BMS reads as an overcurrent event if cell voltage is already at the lower edge of the acceptance window. The protection circuit trips and the radio drops off mid-transmission. This is not a faulty pack — it is a low state-of-charge issue. Charge the battery fully in the dock before the first use shift and the BMS will handle transmit spikes without interruption.

Bar indicator on HP500 shows one fewer bar than expected after swap

The HP500 uses a voltage-threshold bar indicator, not a fuel gauge chip. Each bar on the display corresponds to a voltage band — typically stepping at around 7.2V, 7.5V, and 7.8V under load. A new pack at storage voltage reads one step below full, so the display shows one fewer bar even though the cell capacity is intact. After a full charge cycle in the dock, the resting voltage pushes above the top threshold and the indicator shows correctly. If the display still reads low after a complete charge, check the dock contacts are clean and making firm contact with all three pins.