To display this icon in the status bar, you must have at least one Bluetooth device connected with your iPhone. Your iPhone or iPad can display the battery status of only those devices that are supported by the iOS. But nowadays, wireless devices are becoming more and more popular. So, you may have a Bluetooth headset, an Apple Watch, iPad and you might also be connected with your Macbook via Bluetooth! So, what if you have more than one Bluetooth devices connected to your iPhone? How would you know the battery status of all these devices?, Well, Apple has made the answer very simple. All you need to do is to add a Widget on your phone’s Home screen. The Batteries widget feature was added in iOS 9.
Add the Battery Widget to Know about the Battery Charge of Bluetooth Devices
Switch on your iPhone and scroll the Home screen to the right to reach the Widgets panel. If the Battery widget is not visible, scroll down to the bottom and tap on Edit link. From the resulting screen, add the Battery widget by tapping on the green + sign and then tap on the Done link in the top-right corner. Battery widget will be added to your Widgets panel. This widget displays battery status of all the connected (and supported) devices along with the battery status of the iPhone itself. By default, the widget shows battery status of only Apple devices. But if you tap on the Show more link, you will see the status of other connected devices also, if any.
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