Solutions:
1. Confirm whether the input voltage and current of the charger meet the requirements. If not, please replace it.
2. Replace the charging cable and charger to try whether it can be charged. If it can be charged after replacement, it may be the problem of the charging cable or the charger.
3. Use the charging cable and charger to charge other devices, and verify whether the charging cable and charger are normal. If it can charge other devices normally, please charge the charging case for half an hour before observing.
4. If all the steps fail, it is suggested to apply for after-sales inspection.