Sometimes it's good to know why your phone isn't lasting a full day. Apple says the battery inside your iPhone is designed to last a full day. While this is mostly true, the way you use your phone can make it drain a lot quicker. Some apps can deplete the battery quickly without you even noticing. The good news is that iOS provides tools that let you check your iPhone's battery usage. Some of the reasons why you're losing battery are out of your control, but knowing which apps are draining it can help your iPhone last until the end of the day. Changing a few settings can help, too.

Finding the apps that drain your iPhone battery starts in the Settings app on your iPhone. Open it and look for the Battery menu — it's the one with the green icon. It should be easy to find since it's one of the first options in the list, near Wi-Fi and Cellular. Here, you'll find a detailed chart showing exactly how you've been using your iPhone. Tapping View All Battery Usage brings up an even more detailed list of exactly what's draining your battery. Even if you don't have one of the latest handsets, you can still access this information. It's been available since iOS 8.

Changing a few settings can help apps use less battery. For instance, you can disable Background App Refresh within the General section of the Settings app. This feature allows apps to refresh their content even when you're not using them, which helps things load faster but can be a drain on resources. You can either turn it off for specific apps or disable background updates entirely. Managing how apps access your location also helps your battery last longer. That's because constant use of GPS also consumes a lot of resources. This time, look for Location Services in Settings, under Privacy & Security. Turn off location access for apps that don't really need it. If you don't want to go that far, change the setting to While Using the App — this will prevent the app from using GPS in the background. Just avoid turning off Location Services completely, since that would also affect important services like Find My. One last thing: Check your iPhone's battery health, too. It doesn't matter what apps or settings you use if the battery is in bad condition. In that case, a battery replacement might be your best option.