Smartphone repair experts iFixit have revealed that the new iPhone 6 Plus carries a 2,916mAh battery. iFixit, who routinely take apart every big new tech product, discovered during its iPhone 6 Plus teardown that the 5.5-inch phone is rated at 3.82 V and 11.1 Wh of energy, which equates to 2,915 mAh. This puts the iPhone 6 Plus battery capacity at nearly double the 1,560 mAh of the iPhone 5S.