Please NOTE :
Power bank has two regular standard of capacity , one is the battery capacity, one is the rated capacity. The 10000mah power bank, being labeled 10000mah/3.7v core capacity be converted to rated capacity 6500mah/5v.
Why exist this difference?
Use it for longer period of time
Also, The conversion rate of the entire mobile power industry is basically in the range of 60%-70%. Please kindly noted.