1. If the earbuds and charger case are out of battery, charge them continuously for more than 2 hours.
2. Replace the cable and charger and check if this resolves the issue.
3. Check if there is any dirt inside the earbuds' copper pillars and charging case pogo pin.
4. Ensure the earphones are charging at a comfortable temperature (about 25°C).
If the issue persists, please contact our Customer Support.