what kind of battery does an iphone use
By comparison, the iPhone 6 Plus has a 2,915 mAh battery and the iPhone 6 a 1,810 mAh battery, according to iFixIt. Not surprisingly, the iPhone 6's battery life of 7 hours and 27 minutes was less than the S5, both on Verizon and AT&T. However, the 6 Plus' runtime of 10 hours beat out the S5s.
The photos (via MacRumors) show a battery with a 1,810 mAh capacity, which is a bit bigger than the iPhone 5s' 1,560 mAh battery. This isn't too surprising considering that the iPhone 6 is expected to feature a larger display with a higher resolution than that of the iPhone 5s.