It may be that the mobile power supply has entered the charging protection state, or it may be that the output of the charger is too small.
1, the mobile power in a long time charging or voltage is too high when it will enter the charging protection state, this time is not charged into the power, the mobile power plug in the computer USB output above 2 hours of charging can be removed from the protection state, and then you can charge normally.
2, the speed of charging the mobile power mainly depends on the output current of the charger used, the mobile power is not equipped with a charger, it is recommended to use their own mobile phone charger to charge, the general output voltage of the mobile phone charger is 5V voltage, the size of the current determines the charging speed, For example, the output is 5V-0.5A charger can charge an average of 500 MA per hour, plus wire resistance consumption, may be a little less, 7,000 MA will be charged for a little more than 14 hours to be full. If it takes more than 7 hours to charge with a 5V-1A charger, it only takes 4 hours to be fully charged with a 5V-2A charger.