Power bank, also known as mobile power, portable charger, is a portable electronic device, mainly used to provide additional power for mobile phones, tablets, laptops and other mobile devices. Power banks typically have built-in lithium-ion batteries that can store electrical energy and charge other devices when needed. Here are some details about the power bank: 1. Capacity: The capacity of the charging bank is usually measured in milliampere-hours (mAh), indicating the amount of electricity it stores. The larger the capacity, the longer the device can theoretically be charged. However, capacity is not the only factor that determines the performance of the charging bank, and factors such as charging speed and compatibility also need to be considered. 2. Input/output power: The input and output power of the charging bank determine the charging speed. The higher the output power, the faster the device can be charged; The higher the input power, the faster the charging speed. In addition, power banks usually have multiple USB ports, which support charging multiple devices at the same time. 3. Battery type: The battery types used in the charging bank mainly include lithium-ion batteries and lithium polymer batteries. Lithium-ion batteries are more common and cost less, but they are larger and heavier. Lithium-polymer batteries have the advantages of being thinner, lighter and safer, but at a higher cost. 4. Charging times: The charging times of the charging bank are affected by factors such as capacity and device power consumption. Usually, a power bank can charge a mobile phone 1-3 times, and a tablet computer 1-2 times. 5. Safety features: The safety of the charging bank is very important, and it needs to have over-charge, over-discharge, overheating, short circuit and other protection functions. When purchasing a power bank, please choose a product with relevant certification and security protection. 6. Compatibility: The charging treasure should have a wide range of compatibility and support various brands and models of mobile devices. When purchasing a power bank, please check the range of compatible devices listed in the product description. 7. Brand and price: There are many charging banks in the market