Why does it mean if my battery icon in the upper right is Orange?
What does an orange battery icon mean?
iPhone 11 Pro
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Is it possibly yellow rather than orange. See information in Use Low Power Mode to save battery life on your iPhone or iPad - Apple Support including the following:
When Low Power Mode is on, the battery in the status bar will be yellow. You'll see a yellow battery icon 
and the battery percentage. After you charge your iPhone or iPad to 80% or higher, Low Power Mode automatically turns off.