Lenovo Powerbank 10400 mAh On Amazon @ Rs. 1160 (seller : Online heart)
http://www.amazon.in/gp/offer-listing/B00JYT4DDI

About Product:-
Part Number: Gxv0f78691 Lenovo 10400mah Power Bank USB Socket Battery Charge Indicator
Specification: Brand : Lenovo Color : White Compatibility : Can Be Used To Charge Any Usb Device
Input Power : 5V / 2A Output Power : 5V / 0 - 2.1A Type : Li-Ion Capacity : 3.6V 10400mah Charging Time : 5 - 5.5 Hours
Input Connector : Micro USB Output Connector : USB
In The Box : One Power Bank From Lenovo, USB Cable, English manual.


Price Comparison:-
Snapdeal @ Rs. 4300
http://www.snapdeal.com/product/lenovo-powerbank-pa10400-white/667240140481
flipkart @ Rs. 1945
http://www.flipkart.com/lenovo-pa10400-10400-mah/p/itmefmu49uzgh2hz?pid=PWBEFMU4DATHYSB9