Power bank deal ?

Here are some of the best power banks in the market:
1.Mi:
a) 10000 mAH Power Bank, silver color for Rs.1,299: https://www.amazon.in/Mi-10000mAH-Power-Bank-Bl...
b) 20000mAh Power Bank, white color for Rs.2,199: https://www.snapdeal.com/product/xiaomi-mi-mi-2...
2. Ambrane
a) P-1111 10000 mAh, black color for Rs.619 (including Rs. 25 shipping and coupon code- PB15 to get a free movie ticket and 15% cashback): https://paytm.com/shop/p/ambrane-p-1111-10000-m...
b) P-1310 13000 mAh, black & gold color for Rs.919 (including Rs. 25 shipping and code PB15 Rs. 105 cashback), you can use the coupon code- PB15 to get a free movie ticket and 15% cashback: https://paytm.com/shop/p/ambrane-p-1310-13000-m...
3. Romoss:
a) Solo 5 10000 mAh (PH50-491-01), black color for Rs.999: http://www.amazon.in/Romoss-10000mah-Power-PH50...
b) Solo 6 PH80 16000 mAh, white color for Rs.1,189: http://www.amazon.in/Romoss-PH80-16000mAH-Power...
I arranged them in the order of which you should consider first.
-Mi is well known for their power bank and is a best seller with a good built, however it is comparatively pricey.
-Ambrane has various series to consider buying from. They have a good quality and are comparatively light weighted and better priced. I feel you should finalize on this.
-Romoss has been in the power bank sector for long and make good, durable power banks, though they are on the heavier side, but that is one of the reasons why it is durable, personally own one and it has fallen quite a bit from heights, still running well.
OnePlus power bank is a good option, but it is not available currently.

Hope this helps .