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. Some manufacturers use inferior materials in order to reduce costs, 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, and third, high safety. Let's share how to choose a good power bank. First, the capacity of the power bank. The battery voltage of the power bank and the battery of the mobile phone are both around 3.7V, and the fully charged battery is 4.2V, just like water flows 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, so the voltage of the power bank must It is higher than the battery of a mobile phone, so 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 conversion rate of the board. Some good power bank 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 passes through the charging line, the charging line will definitely have resistance, and some energy will be lost in this link.
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. This step-down process will have a large power loss, so 5000 millimetres Ann’s power bank is a mobile phone with less than 5000 mAh. So what you bought is a 10000mAh power bank, when 6000mAh is used; 20000mAh is used 12000mA. The charging speed varies with the charging speed of the power bank.
At the same time, some small manufacturers also have a lot of show operations. For example, some old batteries that are about to be scrapped will be recycled to make power banks. Some batteries are rusty, and then the manufacturer packs a 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. Therefore, try to choose some powerful shared power bank manufacturers.