what does it mean when my battery symbol is yellow?
My phone does not always charge on its charger at night. Sometimes when I put it on the charger, the one with the phone and watch chargers, the little light is yellow and not white. Why is that?
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It probably means that you or someone else switched a battery setting to Low Power Mode.
Settings > Battery > Low Power Mode
If the battery drops low enough, it will switch to Low Power Mode automatically, then change back to normal as the battery gets to a higher charge.