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[Re-Titled by Moderator]
The yellow color is warning you that you need to charge the battery. You do not want it to be completely depleted as that is bad for lithium ion batteries. I rarely let mine go beneath 40%. Yours is clear down to 15%.
Your battery is in low-power mode. Charge it and it will turn green eventually. You can also disable by entering the control panel and selecting the battery icon.
You can also manually turn on/off low power mode.
Learn more about Low Power Mode here -
What means the color yellow on iPhone battery percentage?
