About this replacement
Hytera HP700 Series — 7.7V Li-ion Replacement Battery (BP2403)
This 7.7V, 2400mAh Li-ion battery replaces the BP2403 and BP3003 in the Hytera HP700, HP705, HP780, and HP785 portable two-way radios. These radios are used in public safety, security, and commercial field operations where communication cannot drop. Capacity figures are taken directly from product data — 18.48Wh total energy.
- HP700 and HP780 platform fit: The HP700, HP705, HP780, and HP785 share the same battery bay geometry, connector pinout, and BMS handshake protocol. One pack covers all four models without any adapter or modification.
- Bench tested on actual hardware: We cycled this pack on the HP780 and monitored BMS response through PTT-triggered transmit current spikes. The BMS held without tripping across repeated full-power TX bursts.
- First insertion contact check: If the charger 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 dock requires a clean contact cycle to complete the BMS handshake before charging begins.
Why the HP700 cuts out mid-transmission on a new BP2403
A new Li-ion pack ships at storage voltage — typically 3.7–3.8V per cell, not full charge. When the HP700 fires a high-power TX burst, the BMS sees a sudden current draw against a partially charged cell and triggers an overcurrent cutoff. The radio goes silent mid-transmission even though the battery is brand new. A full charge cycle before the first field shift eliminates this. Once the cells are at 4.2V per cell, the BMS has enough headroom to handle transmit spikes cleanly.
Bar indicator showing one fewer bar than expected after fitting the BP2403
The HP700 series uses a voltage-threshold bar indicator — it reads pack voltage directly and maps it to bars. A new cell at storage voltage sits below the top threshold, so the radio shows three bars instead of four even with a fresh pack. This is not a fault. Charge the battery fully in the dock until the LED goes green, then reinsert — the indicator will read the correct voltage and display the expected bar count.