1. Understand your battery usage
Head to Settings → Battery to check out the details of your battery usage. Last 24 Hours will be the default for showing what apps are using the most energy. Tapping the clock icon on the right hand side gives you a detailed breakdown of how much time was spent on screen and in the background for each app.
Also take a look at battery life suggestions just above battery usage. This will give you quick, actionable ways to reduce battery drain. Now you’re in a better position to be more efficient with usage, along with having an idea of more settings to adjust as we keep going here.
2. Low Power Mode
Low Power Mode isn’t new in iOS 11, but it’s a really useful feature to stretch your battery life when needed. The feature works by suspending mail fetch, background app refresh, auto downloads, and more. This isn’t a ‘use every day’ type of feature (hopefully), but is handy in a pinch.
You can turn on Low Power mode under Settings → Battery. However, it’s really useful to have quick access to Low Power Mode by adding it to iOS 11’s redesigned Control Center. Navigate to Settings → Control Center → Customize Controls, then tap the green + sign next to Low Power Mode.
3. Adjust Auto-lock and Screen Brightness
If you notice Home & Lock Screen usage on your battery usage higher than you’d expect, double-check that setting. If you can tolerate it, 30 seconds will help you preserve the most battery life. Especially with most of Apple’s iPhones supporting raise to wake, 30 seconds is usually worth it.
Lowering your screen brightness will also help with battery life, but this will likely come down to personal preference.
4. Background App Refresh
Low Power Mode turns off background app refresh across the board, but you can customize which apps use this feature for a more convenient experience as well as improved battery life. Head to Settings → General → Background App Refresh.
You can also opt to only use background app refresh on Wi-Fi in addition to Wi-Fi and Cellular or turning the feature off. However, most users will find leaving Wi-Fi and Cellular on while customizing which apps are used for background app refresh to be the best fit.
5. Location Services
Taking a look at your location services settings is another way to be more efficient with battery life (and cellular data usage). Head to Settings → Privacy → Location Services to update the privileges for your apps.
6. Push and Fetch
Taking a look at your push and fetch settings is also worthwhile. Navigate to Settings → Accounts & Passwords → Fetch New Data. One possible approach is to leave your primary account(s) as push to receive new mail asap, and turn secondary/non-crticial accounts to fetch every 30 minutes or hour.
Find the culprits
Some apps are particularly power-hungry. But how you can determine the worst offenders?
Tap Settings > Battery, then wait for the Battery Usage section to load. Now check to see which apps are consuming the most juice. You can toggle between readings for the last 24 hours and last 7 days.
On my iPhone, messaging is the killer: Groupme and Apple’s own Messages app were responsible for a whopping 30 percent of battery usage over the past week. (Your mileage may vary; I message a lot.)
This info may be actionable and it may not. The two aforementioned apps, for example, are ones I need. But if you discover power-draining apps you don’t use often (or at all), consider deleting them — or at least switching to browser-based alternatives. Speaking of which…
Ditch the Facebook app
As if you needed another reason to say goodbye to Facebook app, the social network’s iOS app seems to consume more share battery. On my iPhone, it’s currently responsible for 14 percent of the battery drain over the past week. Check your settings, as described above, and see if it’s similarly power-hungry on your phone.
If so, and you’re not ready to abandon the service altogether, there’s another option: Delete the app and access Facebook in your mobile browser. You may lose a few amenities, but in return you’ll keep access to the service with considerably less impact on your battery.
On average I had 15% more battery left by 10.30pm each day. I had also saved space, because at the point I had deleted the Facebook app it had consumed around 500MB in total combining the 111MB of the app itself and its cache on the iPhone.
To make sure that this wasn’t an isolated incident, I also recruited several other Facebook-using iPhone owners to conduct a similar test. They all found similar results, with increased battery life when using Facebook in Safari having uninstalled the main Facebook iOS app.
As noted in that last sentence, deleting the Facebook app doesn’t mean forgoing Facebook: You can sign into the service using your mobile browser, which should have almost zero battery and storage impact. Granted, you’ll have to live without a few app-specific amenities, like the omnipresent toolbar (in the browser, it disappears when you scroll away) and auto-playing embedded videos.
If you’ve ever searched for tips on prolonging iPhone battery life, you’ve almost certainly encountered this one: turn off email fetch. The reasoning: battery life suffers if your phone automatically checks for new mail every 15 or 30 minutes.
That’s why I always kept my accounts set to “manual,” as I prefer to retrieve mail when I want to retrieve mail.
However, after installing iOS 11, I noticed there were frequently new messages waiting for me each time I opened the Mail app. So I checked my email account settings (which, incidentally, are no longer found in Settings > Mail — sigh) and, sure enough, all my accounts had been set to Fetch!
Selectively disable notifications
Same deal: Every dang app wants to notify you of every little thing all the time, but some shouldn’t be allowed the privilege. Notifications not only distract and annoy, they also eat up battery.
To disable them, hit the Settings app, tap Notifications, then tap each app you don’t want bugging you. Once inside the settings for any given app, slide the Allow Notifications toggle to off.
Depending on how many apps you have installed, this may take some time. If it seems overwhelming, maybe just knock out 10 per day until you’ve made it through the list.
I’ve also read that people have experienced better battery life by turning off “Hey Siri” because it means your iPhone isn’t always listening, waiting to spring into action when you utter those two magic words. To disable this feature, go to Settings > Siri and toggle off Allow “Hey Siri.”
This one is harder to pin down, where your iPhone dies before the battery meter hits zero. I’ve read advice about calibrating your iPhone’s battery by letting it drain all the way down and then charging it back to 100 percent. I also suggest you follow this three-step process to address an iPhone that shuts down suddenly:
1. Check for a software update
Perhaps there’s a new version of iOS that will play nicer with your iPhone and its battery. Go to Settings > General > Software Update to see if an update is available.
2. Restore from backup or factory reset
If you are running the latest version of iOS, then you might need to hit the reset button and start fresh. You can try restoring your iPhone to a recent backup you’ve made in iTunes or iCloud. If that doesn’t do the trick, then you might need to perform a factory reset. It’s a pain to get your phone set back up the way you like it, but at least your app purchases are available in the App Store so you can reinstall them for free. To perform a factory reset, go to Settings > General > Reset and then tap Erase All Content and Settings.
3. Head to a Genius Bar
If your battery problems persist past a factory reset, then it might be time to visit your local Genius Bar or mail your phone in for repair. Apple can then run its diagnostics to see if there is a hardware issue with your phone you can use the Apple Support App. You can read about Apple’s battery warranty and start a repair request https://support.apple.com/iphone/repair/battery-power
Personally, extreme temperature is often to blame for my iPhone shutting down seemingly at random. I live in Miami and summers can get very hot. When I’m skiing or just out walking the dog on a particularly cold day in January, my iPhone will occasionally shut down. Same thing if I leave it in the direct sun in August. Apple recommends https://www.apple.com/batteries/maximizing-performance/ you keep your iPhone between 32 degree and 95 degree Fahrenheit, with 62 to 72 degrees being the ideal comfort zone.
My phone gets hot when charging
That off-brand charger you picked up at CVS or Walmart? It might have cost a fraction of what you’d pay Apple for a replacement charger, and it might also come in a fun color other than white. But if your iPhone heats up to a worrisome degree when it’s plugged into your cheap charger, then it’s time to locate the charger that came with your iPhone or find a suitable replacement. You don’t necessarily need to buy from Apple, but Apple recommends https://support.apple.com/en-us/HT204566 you use only certified third-party accessories that have the Made for iPhone/iPad/iPod logo on their packaging.