Vertex Standard VXD720 Compatible Battery 7.5V 1800mAh

Vertex Standard VXD720 — 7.5V Li-ion Replacement Battery

This 7.5V 1800mAh Li-ion battery replaces the original pack in the Vertex Standard VXD720 portable two-way radio. The VXD720 is a compact commercial-grade transceiver used in industrial and field communication roles. Voltage and capacity match the original specification so the radio powers on and charges without modification.

• VXD720 platform fit: The VXD720 uses a 7.5V three-cell Li-ion configuration with a specific BMS handshake required by the charger dock. This pack matches that voltage rail and connector pinout so the dock accepts the battery and progresses through its charge cycle normally.
• Bench tested on actual hardware: We cycled this pack through transmit and receive loads matching the VXD720's RF output draw. The BMS held stable under PTT press current spikes and did not trigger overcurrent cutoff during sustained transmission bursts.
• First insertion into the charger dock: If the dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The VXD720 charger 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

A new Li-ion pack ships at storage voltage — typically around 3.7V to 3.8V per cell, not full charge. When the VXD720 keys up for transmission, current draw spikes sharply. If the pack is at storage voltage, that spike can push cell voltage below the BMS cutoff threshold, causing the radio to drop out mid-PTT. Charge the pack fully before the first use in the field. After a full charge cycle, the cells stabilise and the BMS handles transmit spikes without interruption.

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

The VXD720 reads battery level using voltage-threshold detection, not a fuel gauge chip. A new pack at storage voltage sits in a lower threshold band, so the radio displays one or two bars even though the cell capacity is intact. This is not a faulty battery. Put the pack through one full charge cycle in the dock until the charge LED goes green, then power on the radio — the bar indicator will reflect the correct charge level at or above 7.4V resting voltage.