The leaked battery has a capacity of 2750 mAh, that's 165 mAh less than the iPhone 6 Plus battery at 2915 mAh.
Notably, Apple revealed a similar reduction in battery capacity for the iPhone 6s. Confirmation of the smaller battery size came from the iPhone 6s Introduction Video which shows the battery marked with a capacity of 1715mAh. That's down from the iPhone 6 at 1810mAH.
Despite the smaller batteries, power consumption improvements in the newer iPhones are expected to offset the capacity loss. We'll let you how battery life is once Apple releases the iPhone 6s on September 25th.
Read More [via Blair]