Please NOTE :
Power bank regular standard two capacity, one is the battery capacity, one is the rated capacity. The 10000mah power bank, charging treasure will be labeled 10000mah/3.7v core capacity, at the same time labeled rated capacity 6500mah/5v.
Why exist this difference? (the battery capacity is 10000mAh, its rated capacity is 6500mAh)
There are many reasons for this difference.The most important reason is the conversion rate. Because most of power bank's battery voltage is 3.7V, and charging treasure needs to increase the voltage to 5V when charging the mobile phone, which making the charging treasure's conversion efficiency only 3.75/5=74%, Also include generated heat when battery voltage boosting, and various of wire consumption, Electricity and self-consumption. these points add up to account for 30%-40% of the power of the mobile power source.So the 10,000mAh charging treasure can really be used by us only about 6500mAh.
Also, The conversion rate of the entire mobile power industry is basically in the range of 60%-70%. Please kindly noted.
Please search on Google if want to know the details