http://allthingsd.com/20130917/5c-c...ice-price-for-newcomers-or-thrifty-upgraders/
This past weekend I used both the 5C and my own iPhone 5 at the same time, with the display on both set to about 75% of full brightness and their batteries fully charged. I ran the same apps, including maps apps, browsed through both Safari browsers and made phone calls on both phones. When my iPhone 5 died on Saturday night, the 5C had 17% battery power left.