Connect AirPods Max to a power outlet using a Lightning to USB Cable and a compatible power adapter.
Note: To help maintain the battery charge when you’re not using AirPods Max, put AirPods Max in sleep mode by placing them in the Smart Case. (You can’t play audio on AirPods Max when they’re in the Smart Case.)
See the Apple Support article How to charge your AirPods Max and learn about battery life.
