Vertex Standard VXA-710 Replacement Battery 7.4V 1400mAh

Vertex Standard VXA-710 / VX-5 Series — 7.4V Li-ion Replacement Battery

This 7.4V, 1400mAh lithium-ion battery replaces the stock pack on the Vertex Standard VXA-710, VX-5, VX-5R, and VX-5RS handheld transceivers. It fits the same contact footprint as the original and the BMS speaks the same handshake the dock and radio expect. No OEM part number is listed for this SKU — match your radio model against the fit list before ordering.

• VXA-710 and VX-5 platform fit: These models share a common 7.4V two-cell architecture, the same rear-contact strip geometry, and a BMS protocol the dock polls on first insertion. That shared spec is why one pack covers all variants in the series.
• Bench tested on actual hardware: We cycled this pack through transmit-load draws on the VX-5 platform. The BMS held the discharge curve cleanly through sustained PTT bursts and did not trigger overcurrent cutoff under normal keying patterns.
• First-insertion contact check: If the dock shows a fault LED on first insertion, pull the battery, wipe the gold contact strip with a dry cloth, and reseat firmly. The Vertex dock runs a contact-integrity poll before it accepts the BMS handshake — a film of handling residue on the contacts is enough to fail that check.

VXA-710 cuts out mid-transmission on a new battery

A new pack arrives at storage voltage — typically 3.7V per cell, around 7.4V total — not at full charge. When you key up, the transmit current spike can pull that already-low cell voltage below the BMS protection threshold, triggering a momentary cutoff. The radio interprets this as a fault and drops the transmission. Charge the pack to full in the dock before the first use and the BMS will have enough headroom to handle the PTT surge without tripping.

Bar indicator showing one fewer bar than expected after fitting this pack

The VX-5 series uses a voltage-threshold bar indicator — each bar maps to a fixed cell voltage range, not a fuel gauge chip. A new pack at storage voltage reads in the lower threshold band and displays one or two bars even though capacity is full. Put the battery through one complete dock charge cycle first. Once the cells are at their rated top-of-charge voltage, the indicator will read correctly.