http://www.newnow.com/products/4200mah-sony-l36hxperia-z-battery-power-bank-charger-case.html
Features:
Ultra-thin design and perfect dimensions
Very light and convenient to carry.
Easy installation and removal
360º Protective and powerful.
Flip cover to protect the screen
Stand clip
Works as both an iPhone extended battery set and a protection case.
External battery charger case for iphone 5