Posted 5/30/2020 00:59 (#8288598 - in reply to #8287965) Subject: RE: i-phone question?
Ask Google. Here is what came up for an answer.
"Low Power Mode
Your iPhone battery is yellow because Low Power Mode is turned on. To change it back to normal, go to Settings -> Battery and tap the switch next to Low Power Mode. Low Power Mode turns off automatically when your battery level reaches 80%.Nov 29, 2015"