Try replacing a data cable
Method 1:
1, it is possible that the charging case is out of power.
2. It is recommended to charge the charging box separately first.
3. After it is full, put in the earphones to charge the earphones.
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Method 2:
1. Dust in the earphone or charging box may also lead to failure to charge.
2. Try to wipe the inside of the headset and charging case with tissue or glasses cloth.
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Method 3:
1, if the above two methods do not work, it may be bad.
2, if conditions, see if other airpods can be charged to confirm whether the charging box is damaged or the earphones are damaged.
3, if you can not confirm, you can also go to the Apple repair shop directly to find a solution.