Here comes one of the cheapest power bank in the market from Intex. This is a 11000 mAh battery which is available for a discounted price of INR 999 (Actual price is INR 1099). You may have a look on other Powerbanks and their features and prices for a comparison. Now if you buy this frpm paytm, you can get this for an effective price of INR 699. You will get INR 300 as cash back.
Now the product details.
11000mAh Li-Ion battery
It will have a 5V / 2.1A input and 3 output ports with 5V 1A, 5V2A & 5V 2A
It will have a 6 Months Manufacturer Replacement Warranty
You can return the product with in 15 days if the item is damaged
Seller will accept returns within a 15 days from date of delivery of the item only in the case of damaged, defective or wrong products received
There are few interesting things , on SnapDeal where the item is out of stock now shows 12 months of warranty.
Here is the paytm and snapdeal links.