Panic full, can anyone help me. My iphone keeps rebooting

Make sure that your device has the latest version of iOS or iPadOS and that your apps are up to date.

Please follow the steps in the following link for support with this issue: If your iOS device restarts or displays the Apple logo or a spinning gear unexpectedly

karlcristyn wrote: "Noooo, there's no visible battery health for my iphone."

And, again, was the battery replaced by a qualified technician using a genuine iPhone battery?...

About genuine iPhone batteries

Repair Provider Verification - Official Apple Support

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karlcristyn wrote: "...It's already replaced. Even if I change it to other batteries, my phone keeps restarting"

karl ~ Again, what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

And was the battery replaced by a qualified technician using a genuine iPhone battery?...

About genuine iPhone batteries

Repair Provider Verification - Official Apple Support

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karl ~ Instead of posting duplicates about the same issue, please simply answer the question above. Here it is yet again:

Was the battery replaced by a qualified technician using a genuine iPhone battery?...

About genuine iPhone batteries

Repair Provider Verification - Official Apple Support

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karlcristyn wrote: "Noooo. It's not a genuine battery and it's not replaced by an apple store technician but he does have a skill to change the battery"

karl ~ Have the battery replaced by a qualified technician with a genuine iPhone battery and your mysterious reboots will probably cease:

iPhone Battery & Power Repair

...Article found by searching Apple's Knowledge Base.

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karl ~ Does your iPhone XS Max still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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