please note :
The power bank has two normal capacity standards, one is the battery capacity, the other is the rated capacity. The 20000mAh power bank, labeled 10000mAh / 3.7V, is converted to a rated capacity of 12400mAh / 5V.
Why is there this difference?
The most important reason is the conversion rate. As most of the power bank battery voltage is 3.7V, and the power bank needs to increase the voltage to 5V when charging the mobile phone, which makes the conversion efficiency of the power bank only 3.75/5=74%, also includes the heat generated when the battery voltage is increased, and various consumption Wiring, electricity and self-consumption. These points add up to 30%-40% of the power of the mobile phone power supply, so the power bank of 20000mAh that can be used by us is about 12400mAh.
Also, the conversion rate for the entire mobile power industry mainly ranges between 60%-70%. Please kindly note.
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