iPhone 5S and 5C Battery Specs
AnandTech did some digging into some FCC documents and found the specs for the batteries of the iPhone 5S and 5C. The battery for the iPhone 5S is 1570 mAh, about 10% better than the iPhone 5. The battery for the iPhone 5C is 1570 mAh, 5% better than the iPhone 5. Even though it is $100 cheaper than the iPhone 5 it still has a better battery. As a comparison, the iPhone 5s battery was 1440 mAh.
You can get full information on the details of how long you can get on the phone and the web via the devices tech specs on Apple’s site.