You may have noticed that Apple released yet another software update. This one is iOS 9.2.1 and is 38.1 MB. This update is for Mac, iPhone, and iPad. This update is focused on bug fixes, security fixes, and performance improvements.
It will not fix the battery meter bug, but this intermediate update allows Apple to address it in the next update along with the ability to add live photos in messages and passcode for notes.
Other updates to watch for are “Night Shift”, “Car Play” improvements, and yes even addressing why your battery meter gets stuck when you change your time zone.
To view this update on your iPhone or Ipad, go to the settings app, click on general, and click on Software Update page.
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For more information click n on: https://support.apple.com/HT201222