For iOS 11.3 & Up Users, Look In the Settings

Open up the settings app, and then navigate to Battery > Battery Health. From there, you’ll see a percentage next to “Maximum Capacity,” which gives you a good idea of whether or not your iPhone’s battery is in good health—the higher the percentage, the better.

Below that, you’ll see how your iPhone is performing based on the battery health in the small text below “Peak Performance Capability.” For batteries in good shape, you’ll probably see “Your battery is currently supporting normal peak performance.” Otherwise, you might see a different message if your battery is degraded at all.

Get More Specific Metrics with Battery Life Doctor

There are quite a few apps out there that will check the status of your battery right from your phone, but we found one that is pleasantly simple, free, and available in the App Store. If you can put up with some annoying ads, Battery Life Doctor can give you a straightforward, no-nonsense display of your iPhone’s battery health status. There are several different sections in the app, but the one you’ll want to focus on is “Battery Life”. Tap on “Details” to get more info about your battery’s health status.

On this screen, the first thing you’ll notice is the big graphic, which tells you the overall health of your battery, either by saying “Perfect,” “Good,” “Bad,” etc. You’ll also see “Wear Level” followed by a percentage. This is how much your battery has degraded. So if it reads 13%, then the total charge capacity that the battery can hold is 87% of its original maximum (a brand new battery will be 100%).

Further below, it will show you a few things, including how much juice is left on the current charge (which your iPhone provides you with anyway), the charge capacity (as mentioned above), the battery voltage, and whether or not the phone is currently charging.