As an iPhone user, one common user activity is to watch a video. While you’re watching a video, there are very few things that could occur that would justify the phone stopping the video and grabbing your attention. An example of something that would justify stopping the video would be an incoming phone call. 

I noticed an example where I did not appreciate the phone stopping the video. This occurs when the phone is running low on battery. If the phone reaches 20% or 10%, you will see a dialog alert like this and your video will stop mid-stream: 

I do recognize that it is important for the OS to get the user’s attention for this use case, but I think there’s a better way of doing this. To explore a better way of doing this, we can look no further than the iOS update to how text messages are treated. Previously, text messages in iOS, would be shown as a dialog alert just like above: 

As of iOS 4.0 (or was it 5.0?), text message alerts are not as intrusive and can float to the top of the page: 

So the idea for this enhancement would be the same. If the user is watching a video, simply show them an alert but have it exist in the background with a dismiss button. This way, the user can continue to watch the video without being interrupted and know that their iPhone is about to run out of battery.