There may be many reasons why the charging alarm clock cannot be charged, such as poor USB interface, damaged charging cable, aging charging alarm clock battery, and so on.
If the USB interface is bad, you can replace the USB interface to repair the charging alarm clock. If the charging cable is damaged, you need to replace it with a new charging cable. If the battery of the charging alarm clock is aging, the problem cannot be solved by simply changing the battery, and it needs to cost more to repair. Secondly, we need to consider the response measures when the charging alarm clock is not charged
The battery is broken, you can consider replacing the battery.