The phone charging sign turns yellow because the low battery mode is turned on. The setting method is as follows:
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1. Open the \"Settings\" menu of the phone, enter the Settings and click the \"Battery\" option;
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2, then turn off the \"low power mode\" switch, then you will find that the battery icon is not yellow;
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3, low power mode is Apple began to add in ios9 system version. When Low Battery mode is enabled, the battery icon turns yellow. Low power mode can extend the iPhone's battery life by three hours. Other performance improvements in iOS 9 will extend battery life by an hour without turning on low power mode.