http://www.amazon.in/dp/B00T654DTY

3.7 volts lithium-ion battery with 5200mAH capacity
Compatible with smartphones, cameras and MP3/MP4
Input: DC 5V-2.1A and output: DC 5V-1A
Smart power management controller with high power discharging efficiency
With good insulation safety and can prevent overcharge, over discharge, over current and short circuit incident
Slim cylindrical design with high quality and durable matte plastic casing
1 year limited warranty for device from the date of purchase