I had bought this 20000 mi power bank in 2017 And I had extraordinary involvement in it since I have utilized not many power bank of my friends and family members however I felt they are acceptable yet not that quick Charging power bank as I understood with this mi power bank. So at whatever point you go to travel and someplace so you should convey this power bank in your sacks in the event that u r utilizing a cell phone having around 4100mah battery, at that point This power bank can charge your telephone at least multiple times and when u need to charge your power bank then you should utilize your quick charger or unique mi charger to charge your power bank till 5-6 hour to charge fully. Following multi-year it will get moderate however by and large I had incredible involvement in this force bank.