iPhone 12 Pro Max Battery parameters: Built-in lithium-ion rechargeable battery MagSafe Wireless charging (power up to 15 watts)10 Qi Wireless charging (power up to 7.5 watts)10 Fast charging via USB connection to a computer or power adapter: 30 minutes up to 50% charge 11, using a power adapter of 20 watts or more (purchased separately) Specific duration as follows Video playback: up to 20 hours Streaming video playback: up to 12 hours Audio playback: up to 80 hours