The core product of the shared power bank is the shared power bank in the cabinet. The quality of the power bank will directly affect. In order to reduce costs, some manufacturers will use inferior materials, so how to identify such a power bank?
An easy-to-use power bank must have three elements: first, sufficient capacity; second, fast charging speed; third, high safety. Here is how to choose a good power bank. First, the capacity of the power bank. The battery voltage of power bank and mobile phone is around 3.7V, full of 4.2V, just like water flowing to the end. If the battery voltage of the power bank is the same as the battery voltage of the mobile phone, it cannot be charged. Therefore, the voltage of the power bank must be higher than the battery of the mobile phone before the current can flow into the mobile phone.
The voltage cannot be charged, so the power bank will have a chip to pressurize the current to 5V, 9V or even higher. However, this pressure process will lose some energy, which is called the plate-end conversion rate. The conversion rate of some good charging treasure boards can reach more than 90%, but most of them are still around 80%. After too much pressure, the power bank can charge the mobile phone. When the current flows through the charging line, the charging line will definitely have resistance and some energy will be lost.
Each link has energy loss current. After reaching the mobile phone, because the mobile phone battery cannot directly withstand the high voltage of 5V and 9V, the mobile phone will have a charging chip to reduce the voltage to a voltage suitable for charging the battery. There will be a large power loss during the step-down process, so 5000 millimetres Ann’s power bank is less than 5000 mA. Therefore, what you buy is a 10000mAh power bank, when 6000mA is used; 20000mA is 12000mA. The charging speed varies with the power bank.
For small manufacturers, there are often some weird operations. For example, some old batteries that are about to be scrapped will be recycled to make power banks. Some batteries are rusted, and then the manufacturer packs the shell into a new power bank for sale. You may not be able to use this power bank after you have bought it several times. No one can guarantee its longevity and safety. So try to choose some big brand products.
After reading these, do you suddenly understand what? Yes, understanding the working principle and internal structure of power banks plays an important role in identifying the quality of shared power banks.