There are two situations in which the mobile power supply is not charged. One is that the mobile power supply enters the charging protection state, and the other is that the battery is scrapped. Mobile power overcharge or high voltage will make the mobile power into the charging protection state, this time is not charged into the power. Plug the mobile power into the USB output of the computer and charge it for 2 hours. The mobile power will automatically release the charging protection state, and then it can be used normally. If the mobile power supply is not used for a long time, when the mobile power supply is affected by the temperature and humidity, its own power will slowly lose, when all the power is lost after the mobile power battery should be scrapped, it is not stored.