When charging, the red light indicates that the charging is faulty. From the point of view of occasional startup, the battery may be faulty and there is a possibility of virtual electricity.
Virtual electricity refers to the battery has always been in a semi-active state of semi-charging state, a simple understanding of the battery display power display is very high, the actual is relatively low, not the real power of the battery, a full charge, a use of no power.
It could have something to do with his batteries. Is it winter? The temperature is cold, and sometimes this rechargeable battery is not good for him to use, and it can't be charged to a certain amount, so if it is to summer, he will be restored, so you have to be old for a while. Or you can buy something like a power bank
You can call customer service
In addition, it is best to pay attention to the rated voltage and current when charging
The ear won't be able to handle it
If there is no 500mv1a charging head plugged into the usb of the computer is a good choice