The battery of the iPhone 12 Pro Max is lithium-ion (Li-ion) with 3,687 mAh capacity. Its voltage is 3.83V and its energy reaches 14.13 Wh. The device’s design allows for excellent battery life, with up to 20 hours of video playback and up to 80 hours of audio playback. The battery supports fast charging with 20W wired and 15W wireless via MagSafe.