VIG VR8810 Two-Way Radio Replacement Battery 7.4V 2400mAh

VIG VR8810 — 7.4V Li-ion Replacement Battery

This is a 7.4V, 2400mAh Li-ion battery for the VIG VR8810 two-way radio. It slots into the existing battery bay and connects to the radio's power rail using the original contact arrangement. No adapters or modifications are needed.

• VR8810 fit: The VR8810 runs a 7.4V nominal rail with a BMS handshake on insertion. This cell matches that voltage requirement and carries the protection circuit the radio expects before it allows power draw through the RF stage.
• Bench tested on actual hardware: We cycled this pack through transmit loads on the bench. The BMS held the output voltage stable through repeated PTT events and did not trip on the current spike at key-up.
• First insertion on the dock: If the charger dock shows a fault LED on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The VR8810 dock runs a contact-check cycle before it accepts the BMS handshake — a residue film on new cells is enough to block it.

Why the VR8810 drops to reduced TX power mid-shift on a new pack

A new cell ships at storage voltage — typically 3.7V per cell, around 7.4V combined — not at a full charge. The VR8810 monitors pack voltage continuously and steps down transmit power when the voltage reading falls below its RF output threshold. This is not a fault in the battery or the radio. A full charge cycle before field use brings both cells to 4.2V each and eliminates the mid-shift power step-down.

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

The VR8810 uses voltage-threshold bar indicators — each bar corresponds to a voltage band, not a percentage read from a chip. A pack at storage voltage sits in the lower band and displays fewer bars even though the cell is not depleted. Charge the pack fully before reading the indicator. After a complete charge cycle, the resting voltage should sit above 8.2V and the display will show the correct bar count.