a) Check what power charger cx is using

b) If device is not charged from very long time, then ask cx to keep the device on charging for 1 hr

c) Ensure cx is charging the device as it supposed to be charge

d) Charging LED (Red LED) should blink while device is charging

e) Only Type-C cable need to be used to charge the device

f) Ensure continuous power supply in socket

g) Charging via Laptop or computer is recommended

h) High Power charger will cause damage to the battery

i) If there is no LED even after charging the device for 1 hr arrange replacement

Note: Ensure there is no cellophane paper on the earbuds