DJI O4 Relay charging and battery care temperature guide

DJI O4 Relay Charging & Battery Care Guide: 5-40°C Charging and 22-28°C Ideal Range

September 17, 2026

The O4 Relay contains a 6500 mAh Li-ion battery, and DJI separates the battery's operating temperature from its charging temperature. The most important field rule is simple: do not connect a hot relay to a charger immediately after use.

Quick Answer: DJI recommends a USB Power Delivery charger. Do not charge the relay immediately after use; allow the internal battery to cool to near room temperature. Charge from 5°C to 40°C (41°F to 104°F). DJI identifies 22°C to 28°C (72°F to 82°F) as the ideal charging range for battery longevity.

DJI O4 Relay recommended charging temperature and cooldown guidance — Charging and battery-care values from the English Usage section.

Use a USB Power Delivery charger

DJI O4 Relay USB charging diagram — The manufacturer setup illustration begins with charging the relay.

DJI recommends using a USB Power Delivery charger. The source does not give a required charger wattage in this user guide, so this article does not invent one.

Let the battery cool after use

Do not charge immediately after operating the relay. DJI says to allow the internal battery to cool to near room temperature first; otherwise charging may be disabled.

Charging temperature

The allowed charging range in the source is 5°C to 40°C. The ideal range is 22°C to 28°C, which DJI says can prolong battery life.

Operating temperature is different

The relay's operating range is 0°C to 45°C, which is wider than the permitted charging range. Do not use the operating range as a substitute for the charging specification.

Battery fire and electrolyte warnings

The English guide says battery fires can be extinguished using water, sand or a dry-powder fire extinguisher. Battery electrolyte is highly corrosive; if it contacts skin or eyes, wash the affected area with water and seek medical attention.