Does it seem like the charge on your iPhone or iPad doesn't last as long as it should? This can happen with a new device that you use more often than expected, or an elder that doesn't hold the charge as long as it did.
Apple no longer sells $ 29 battery replacement on older iPhones, but it offers a built-in utility that can help you monitor device battery health.
This feature helps combat some of the error information out there about taking care of your phone battery. The built-in battery health value allows you to see which apps and activities are the largest drain, control your iPhone's overall battery health and enable a low energy mode to reduce some background activity.
The tool can also help you determine if you need a new battery or can turn more life out of your existing one. While older phones have had this feature, iOS 12.1 launched it to the iPhone 8 and later.