Vertex Standard VXD720 Replacement Battery 7.4V 2600mAh

Vertex Standard VXD720 — 7.4V Li-ion Replacement Battery

This 7.4V 2600mAh Li-ion battery replaces the factory pack in the Vertex Standard VXD720 portable digital two-way radio. It fits the VXD720 directly and matches the original voltage rail and connector format. Capacity is rated at 2600mAh (19.24Wh) as tested under steady-state load.

• VXD720 platform fit: The VXD720 runs a 7.4V nominal rail with a multi-pin BMS handshake at the dock interface. This pack matches that voltage rail and contact layout, so the charger dock and radio both recognise the battery without manual override.
• Bench tested on actual hardware: We cycled this pack through simulated PTT burst loads — the BMS held stable through repeated transmit-current spikes without tripping overcurrent cutoff. Full charge acceptance was confirmed on the standard Vertex dock.
• First insertion contact check: If the charger dock shows a fault LED on first insertion, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly. The Vertex platform requires a clean contact cycle to complete the BMS handshake before charging begins.

Why the VXD720 cuts out mid-transmission on a new battery

New Li-ion cells ship at storage voltage — typically 3.6–3.7V per cell, not full charge. When the radio draws peak transmit current from a partially charged pack, the BMS can interpret the voltage sag as an undervoltage condition and interrupt output. This is not a fault with the battery. Charge the pack fully before first field use and the BMS will have enough headroom to sustain PTT current draw without cutoff.

VXD720 bar indicator showing one fewer bar than expected on a new pack

The VXD720 uses voltage-threshold bar indicators — it reads the pack's resting voltage and maps it to a bar level. A new cell at storage voltage sits below the threshold for a full bar display, so the radio correctly shows a partial reading. This is not a capacity defect. Fully charge the battery first; once resting voltage stabilises above 8.2V, the indicator will reflect the actual charge state.