I bought a mi powerbank from flipkart.com
It was 10000mah powerbank. For the first few days around 10 days it works really well. My phone battery is 2000 mah so it charge my phone 4 times but it is quite good for a power bank.but after 15 days i noticed that it charged my phone one time fully and 2nd time just 56percent. Battery quality of the power bank is not good or fake. Its not a long lasting product.. I prefer not to buy this so called 10000Mah powerbank.