Just as every iPhone runs out of battery power, so every iPhone has always had the ability to warn when that power is getting low. It’s more complicated than the little icon and notifications would make it seem, but still it is a familiar experience of using an iPhone. And Apple wants to improve it.
Apple plans to have your iPhone predict far in advance if you’re going to run out of charge today, and warn you in time to do something about it.
All iPhones already chart power usage over time; Apple wants to use that information to predict when low power will occur