If u want to buy a power bank in India under 2000 and u cannot wait then here are the best alternatives
1. Asus ABTU005 10050mAH Zen Power Bank (Silver)- ₹1,555.00
This product is exactly clone of Mi powerbank go for it but it is lighter than Mi power Bank.
2. OnePlus 10000 mAh Power Bank (Sandstone Black) ₹1699
Currently it is Out of stock on Amazon Better go to Ebay we can buy it.
3. Huawei Honor AP007 (13000 mAh)- ₹1399
It is a flipkart exclusive Product buy it before it is out of stock.
LINK : http://www.flipkart.com/honor-powerbank-13000-mah/p/itme4j6sfsuhr7xz