Battery percentage suddenly increase with no charge

93% is healthy, so hopefully it was just a random glitch. ...But if it happens repeatedly:

Apple's iPhone User Guide says: "If your iPhone isn’t working as expected, you can try restarting it by turning it off, then turning it back on. If turning it off and on doesn’t fix the issue, try forcing it to restart.":

Turn iPhone on or off - Apple Support

iPhone Battery & Power Repair

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

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chanh ~ What version of iOS is it running?...

Settings > General > About > Software Version

Does your iPhone 11 Pro still have its original battery?

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

Settings > Battery > Battery Health

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