I miss my smart case for my airpods max.What can I do?

Re: "I miss my (lost) smart case for my airpods max".

Sorry, I don't know whether the airpods max smart case may show up in Find My or not

Find your lost AirPods with Find My - Apple Support

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Re: "I can t charge my AirPods max"

"Charge your AirPods Max

"To charge your AirPods Max, plug the Lightning cable that came with your AirPods Max into the bottom-right earphone. You can use a USB-C to Lightning Cable or a USB to Lightning Cable.

Then plug the other end of the cable into a USB charger or port".

(Above is from Apple Support's article: Connect and use your AirPods Max - Apple Support)

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Re: "What can I do?"

If you want, you can enter the serial number of your AirPods Max online:

Find the serial number of your AirPods - Apple Support

Where to enter serial number:

Check Your Service and Support Coverage - Apple Support

You can then follow any onscreen instructions.

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More info: See Apple's AirPods Replacement, Repair, & Service page

Eg: You can scroll down to get an estimate:

AirPods Repair & Service

or

More info: AirPods Express Replacement Service - Apple Support

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Re: "need help please".

If help is still needed: You can also reach out to Apple Support to discuss replacement options.

Here’s their contact link - Apple Support

More Support:

There is also an AirPods Support Website:

Find all the topics, resources, and contact options you need for your AirPods....

AirPods Support - Official Apple Support