Also: After your iOS 27 upgrade, do these 5 things first<\/a><\/p>\n A major iOS upgrade can mean your iPhone runs more background tasks than usual, tasks that use significant CPU power and can even make your phone feel warmer. These background tasks include rebuilding search indexes, analyzing data, and completing other system setup processes.<\/p>\n Before making major settings changes, restart your iPhone and use built-in battery-saver features, like Adaptive Power and Low Power Mode, even temporarily. If these tactics don\u2019t work, here are other things you can do to ensure your iPhone runs more efficiently after upgrading to iOS 27<\/a>.<\/p>\n 1. Change your display settings<\/p>\n An iPhone\u2019s display consumes a lot of energy. Thankfully, a few tweaks can help your phone run more efficiently. One tweak is using Auto Brightness, which helps keep your iPhone display from being unnecessarily bright.<\/p>\n Also: Amazon October Prime Day 2026 is coming: Everything we know so far (dates, times, and more)<\/a><\/p>\n To turn on Auto Brightness, follow these steps:<\/p>\n Open your iPhone Settings.<\/p>\n Navigate to Accessibility.<\/p>\n Select Display and Text Size.<\/p>\n Turn on Auto Brightness.<\/p>\n 2. Turn on Adaptive Power<\/p>\n Adaptive Power mode helps conserve battery by automatically lowering the display\u2019s brightness, limiting background activity, and adjusting extra consumption when your battery usage is unusually high.<\/p>\n Also: iPhone 18 Pro vs. iPhone Duo: How to decide between the foldable and the flagship<\/a><\/p>\n Adaptive Power is already on by default on the iPhone 17 lineup<\/a> and newer, as well as the iPhone Air<\/a>. To turn the setting on in older models, follow these steps:<\/p>\n Open your iPhone Settings.<\/p>\n Go to Battery.<\/p>\n Select Power Mode.<\/p>\n Toggle on Adaptive Power.<\/p>\n 3. Update all apps at once<\/p>\n Third-party applications also get their own updates with a fresh operating system, as they need to fit the new firmware rolled out with iOS 27. These background app updates can consume battery power.<\/p>\n Also:\u00a0iOS 27 is finally here, with the new Siri AI beta \u2013 and 120 security patches<\/a><\/p>\n Luckily, you can run all available updates at once to avoid staggered updates that drain your battery during the day. <\/p>\n Here\u2019s how you can update all your apps with available updates at once:<\/p>\n Go to the App Store.<\/p>\n Tap your profile icon.<\/p>\n Go to App Updates.<\/p>\n Select Update All. <\/p>\n Try this approach when your iPhone is plugged in and connected to Wi-Fi, so you don\u2019t use your battery.<\/p>\n 4. Make some network changes<\/p>\n Changing your network settings can help you save precious battery life, especially after an iOS update. These changes include ensuring your iPhone connects to Wi-Fi rather than cellular when Wi-Fi is available, and potentially turning off 5G and staying with LTE.<\/p>\n Since cellular networks consume more energy than Wi-Fi, it\u2019s more efficient to switch to Wi-Fi when a secure network is available. Your iPhone battery drains quicker in a poor cellular service zone. The device constantly attempts to reconnect to the network when the signal is poor, which consumes considerably more energy.<\/p>\n Also:\u00a0iPhone 18 Pro hands-on: I came for the Burgundy and stayed for the dual-aperture cameras<\/a><\/p>\n If no secure Wi-Fi network is available, see if your 5G signal is weak and switch to LTE. This change may slow your online activity, but a weak 5G signal drains an iPhone\u2019s battery more quickly than LTE.<\/p>\n To switch from 5G to LTE on iOS 27, follow these steps:<\/p>\n Access your Settings.<\/p>\n Select Cellular.<\/p>\n Go to Cellular Data Options.<\/p>\n Navigate to Voice and Data.<\/p>\n Tap on LTE.<\/p>\n Using 5G Auto helps optimize battery life by automatically switching from LTE when 5G isn\u2019t required for performance. Choosing 5G On maintains 5G connectivity, even if it affects your battery life.<\/p>\n 5. Adjust background app behavior<\/p>\n Background activity is one of the biggest culprits for a device\u2019s short battery life, especially right after a major software update like iOS 27. <\/p>\n In addition to rebuilding indexes and updating applications for compatibility, your iPhone also continues to refresh apps in the background.<\/p>\n Also: I tried all 5 Googlebooks, and they feel like a whole new kind of laptop<\/a><\/p>\n You can temporarily turn off background app refresh for non-essential applications by going to Settings > General > Background App Refresh.<\/p>\n Location services can also run in the background and consume your battery. See which applications have location services enabled at all times by going to Settings > Privacy & Security > Location Services. Check unnecessary apps with location services set to Always and switch them to While Using, even if temporarily.<\/p>\n 6. Always keep tabs on battery health<\/p>\n It\u2019s important to check your iPhone\u2019s battery health, whether or not you\u2019re experiencing power issues.<\/p>\n You can check your iPhone\u2019s battery health by going to Settings, then selecting Battery. Scroll down to find Battery Health, which shows the iPhone\u2019s maximum capacity and cycle count and provides a battery health qualifier.<\/p>\n Also: iPhone 18 Pro iFixit verdict: Good luck removing the screen<\/a><\/p>\n A Normal battery health qualifier means your battery is running as it should, while a Service qualifier means that you should consider a battery replacement.<\/p>\n iOS 27 has a Daily Usage view that shows that day\u2019s battery consumption compared to the previous week. This view helps you identify apps and system activities that use unusually high energy.<\/p>\n 7. Be a little patient<\/p>\n Upgrading to iOS 27 entails re-indexing files and photos for Spotlight search and the newer AI-powered search features<\/a>. With Siri AI, your iPhone needs to reanalyze data to update the models that power Siri\u2019s new generative AI features.<\/p>\n Shorter battery life on your iPhone is normal for the first couple of days after installing a new iOS. Unless your iPhone is unusually hot while not in use, shorter battery life doesn\u2019t mean that there\u2019s cause for concern.<\/p>\n Also: Claim up to $95 today from Apple\u2019s Siri AI settlement \u2013 here\u2019s how<\/a><\/p>\n If you\u2019re curious whether your iPhone has finished running background processes and indexing after updating to iOS 27, go to Settings, and then Battery. A note with \u201cOngoing iOS Update\u201d will appear on this page if the system is still running background processes.<\/p>\n \t\t\t\t\t\t\t \t\t\t\t\t\t\t\t\t\t\tMaria Diaz is a staff writer with a passion for home automation, smart home devices, and tablets. With a background in graphic design, photography, and filmmaking, she has a bachelor’s in Mass Communication and experience in journalism and film.![\"Maria](\"https:\/\/www.newsbeep.com\/au\/wp-content\/uploads\/2026\/09\/maria-diaz.jpg\")
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\n\t\t\t\t\t\tSee full bio\t\t\t\t\t<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"ZDNET\u2019s key takeaways iPhones are updating to iOS 27. A new OS can affect battery life. These steps…\n","protected":false},"author":2,"featured_media":902504,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[64,63,203,105],"class_list":["post-902503","post","type-post","status-publish","format-standard","has-post-thumbnail","category-mobile","tag-au","tag-australia","tag-mobile","tag-technology"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts\/902503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/comments?post=902503"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts\/902503\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/media\/902504"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/media?parent=902503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/categories?post=902503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/tags?post=902503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}