I got this product 499/- from diwali sale. It's 10,000mah but I'm using Redmi Note 5 having 4000mah. From this 10,000mah it can be charge 2.5 times (4000+4000+2000)=10,000mah. Let's check it out whether it is true or not?? Before using the power bank, first time charged upto 7 hrs because its already by 2 blinking led light point. then, tested power bank 2 times without using the mobile put in locked then Charging by power bank with my 4000mah battery capacity mobile. Let see the result ?? 1st time charged 5% to 100% (3800mah)? & 2nd time charged 1% to 70% ( 2800mah)? After that powerbank empty?? ??[3800mah+2800mah] = 6600mah?? ??[Got 6600mah out of 10,000mah]?? Then remaining 3400mah??? Don't get panic. ?? Theoretically, We can't use full 10,000mah, Coz of so many reason, check it out by yourself at google. Let me tell you some facts??? If our power bank is 10,000mah just mutiply by 0.66, our result will be [10,000mah*0.66= 6600mah] which 0.66 comes from (2/3) two third of powerbank so, 2 divided by 3=0.66?? Here we can use only 6600mah from 10,000mah.?? But Big negative thing is [When i put the power bank in charge, its takes 11 hour for full charge i bank] Actually it must be charge over by 5-6hrs but which is time to take 10-11grs.?? Finally I give 4 star.????