Iphone xs max turning on and off

Abdullahi_06 Said:

"Iphone xs max turning on and off: My iphone turns it self on and off and than says it has cero in battery but when it turrned it self off it was on 80 prosent"

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Troubleshooting a Boot Loop:

From what you've mentioned, I'd say the iPhone is stuck in a boot loop.  So, refer to my user tip: How to Fix an iPhone in a Boot Loop - User Tip

Hello,

Your battery could be going bad: iPhone Battery and Performance

If the health is below 80%, see this: iPhone Battery Service

Good luck.