Hello friends I use mi power bank. I describe about my experience of this power bank. Mi power bank is costly and slower charging. Above 5h to full charge. Battery life you can 3 times charge full charge of your phone( 0% to 100% , 4000mAH battery he phone) , battery life 8h. Its consist steel casso soft outer case. Designed so beautiful. You must have a high quality charger to full charge of the power bank. It’s provided free charging cable with good quality. It’s not value for money.