Why battery yellow
My iPhone shows yellow color on my battery 🔋 instead of green?
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Hey there,
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.
For more info ☞ Use Low Power Mode to save battery life on your iPhone or iPad - Apple Support
