The AirPods Max Smart Case is a bit of a mystery. Do you need it on at all times to save battery? Do you need to carry it around eveywhere?
AirPods Max, Cosmo Case - Marble Pink
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Smatree Airpods Max Charging Dock for Airpods Max, 2000 mAh Battery Charging Case Airpods Max Case,Airpods Max Charging Station, Airpods Max Travel Charging Portable Bag : Electronics
AirPods Max - Technical Specifications - Apple
Maximum compatible headset dimensions (case inside): 8.4 x 7.6 x 2.3 inches. Compatible with many wired / wireless headphones. Engineered ultra-hard shell protects against drops, impacts or crushes. Soft inner maximize headphones protective in the case. Internal mesh pocket conveniently stores cables, cords, chargers, AMP, earpads, adapters and other accessories.
Geekria Shield Headphones Case Compatible with AirPods Max Case, Will Make Headphones Into Sleep Mode Immediately, Replacement Hard Shell Travel
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AirPods Max Battery Drains Only Slightly Faster Outside of Case - MacRumors
How to charge your AirPods Max and learn about battery life - Apple Support
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AirPods Max case: WaterField Shield hands-on - 9to5Mac