The first is compatibility, the difference in the scope of application-not every portable power banks can reasonably charge your mobile phone. Let's first understand some of the charging requirements and charging parameters for smart devices such as mobile phones and tablets.

    In addition, there are some domestic mobile phones with charging currents of 08A and 0.7A, which means that different devices have different current requirements. If the device is not charged according to the required parameters, it is a safety hazard and may even cause permanent damage to the device.

    If the resistance in the portable power banks is different from the circuit board, or if it has not passed the national inspection, the quality is difficult to guarantee. The mobile power circuit board with poor craftsmanship usually only has a simple boost system, and the battery voltage is simply increased by 3.7V. There is no protection circuit to 5V. 

    Such a simple circuit, the current output is unstable, it may charge our digital device battery, and it may also make the circuit board inside the mobile phone become hot and cause a short circuit, which will burn the circuit board.  

     A few brands of portable power banks are equipped with intelligent identification circuits. When the portable power banks is connected to digital devices, the intelligent identification circuit will automatically start. It can provide different output currents according to different input requirements, different battery capacities, and the entire process. It is fully automatic, safe and convenient, so it is almost compatible with IPhone, Pad, Pod, Psp and most other mainstream smart devices on the market.

   The intelligent identification circuit can effectively prevent the battery from heating due to excessive current and affecting the battery life. At the same time, the charging time is avoided to be greatly extended due to the small charging current, and the charging efficiency is improved. However, please also pay attention to check the maximum input current of the portable power banks and the rated current of your digital device. If the maximum output current of the portable power banks is 2A, it is best to only charge the mobile phone below 2A, and it is not recommended to charge the tablet with a rated current of 2.1A.