It is normal for the mobile power supply to charge slowly. No, the mobile power supply is 18650 battery, which can be removed and replaced.

We can't simply think that the charging speed of mobile power supply is slow and judge it as abnormal.

Actual charging time of charging treasure = (charging treasure capacity x battery voltage)/(input voltage x input current x0.88)

There are two ways to charge the mobile power supply, mainly charging with charger and charging the computer with USB cable. Usually, the charging speed will be faster with the charger, because the output voltage and current of the charger will be larger. It is recommended to use 1-2A charger to store energy for mobile power supply.

In addition, the larger the battery capacity of the mobile power supply, the longer it will take when the input voltage and input current are unchanged. Therefore, when buying a large-capacity battery, we should also consider the charging time.

Finally, it is not recommended to disassemble the battery yourself in case of short circuit.