Power Tube Simple 2600 is an all-in-one external battery with built-in 2600mAh battery specially designed for Micro USB powered devices, available in 5 vivid plastic colors.
No extra cables are needed for charging and re-charging, easy to use.
http://www.mipow.com/en/product/power-tube-2600-simple-for-samsung-galaxy-s3-note2.html