I have purchased this Powerbank from Flipkart a few year ago in Rs 799 but now its all usb ports are defected ! I had given this to a repair shop. He repairs it and after one month it got automatically defected... I don’t what is the reason behind it... Now this power bank is able to charge itself but cannot charge the phones...it is just a torch... And the battery backup was decent in 100% of its full charge it can charge 2 phones with 4000 mah battery...
Finally i would say, if anybody wants to purchase a good Powerbank then don’t go for it... It will simply not last even 1 year...