On iPhone 15 models, iOS 18 will recommend that users set a particular charging limit for their device based on their recent usage habits, with the aim of potentially improving their iPhone battery's lifespan by reducing the time that the battery is fully charged.
All four iPhone 15 models feature a setting that prevents the devices from charging beyond 80% while toggled on, and iOS 18 expands the feature by adding new 85%, 90%, and 95% charging limit options. With the new limit options, iOS 18 now takes a proactive approach to improving battery longevity by recommending a specific charging limit to users via a notification.
The recommendation also appears in the Settings app under Battery → Charging. The charging limit feature remains exclusive to the iPhone 15 lineup on the first iOS 18 beta, with the option not found on the iPhone 14 Pro or older.
In a related change, anecdotal reports suggest that iOS 18 could be recalibrating some devices' maximum battery capacity percentage. In Settings ➝ Battery ➝ Battery Health, "Maximum Capacity" is a measure of battery capacity relative to when the device was new. Lower capacity can result in fewer hours of usage between charges.
The first iOS 18 beta is available for Apple Developer Program members, and a public beta will follow in July. After beta testing is complete, the update should be widely released to all users with an iPhone XS or newer in September.
Alleged photos and videos of an unannounced 14-inch MacBook Pro with an M4 chip continue to surface on social media, in what could be the worst product leak for Apple since an employee accidentally left an iPhone 4 prototype at a bar in California in 2010. The latest video of what could be a next-generation MacBook Pro was shared on YouTube Shorts today by Russian channel Romancev768, just...
An alleged unboxing video for an unannounced 14-inch MacBook Pro with the M4 chip was uploaded to YouTube today by Russian channel Wylsacom. The video was later linked to on social media platform X by Bloomberg's Mark Gurman. It is possible that this is the same MacBook Pro box shown in photos that were shared by leaker ShrimpApplePro in late September, as he claimed that this MacBook Pro...
Sunday October 6, 2024 6:40 am PDT by Tim Hardwick
Apple will announce several new M4 Mac models around the end of October, with the company planning to launch at least some of them as soon as Friday, November 1, according to Bloomberg's Mark Gurman. Writing in his latest Power On newsletter, Gurman said that Apple will launch a new M4 version of its low-end 14-inch MacBook Pro, as well as higher-end 14-inch and 16-inch MacBook Pro models...
Monday October 7, 2024 5:34 am PDT by Tim Hardwick
Apple's new Vitals app for watchOS 11 appears to be impressing some users with its ability to detect potential illness days before symptoms manifest, according to recent reports on Reddit. The Apple Watch app, which analyzes key health metrics measured during sleep over the last seven days, appears to be providing early warnings of impending sickness for at least some Apple Watch wearers...
Sunday October 6, 2024 6:18 am PDT by Tim Hardwick
Apple intends to launch iOS 18.1 with the first set of much-anticipated Apple Intelligence features on October 28, according to Bloomberg's Mark Gurman. Writing in the latest edition of his Power On newsletter, Gurman says the release date is arriving this month later than initially expected, as Apple is reportedly taking extra time to ensure a smooth rollout and prepare its AI cloud...
We're nearing the end of the iOS 18.1 beta testing process, but Apple is continuing to make tweaks to refine built-in features ahead of when the software launches. With testing winding down, there are fewer new additions, but Apple has made changes worth noting. The new beta is available for both developers and public beta testers. Control Center In the Control Center, Apple has added new...
Tuesday October 8, 2024 6:16 am PDT by Tim Hardwick
Rumors strongly suggest Apple will release the seventh-generation iPad mini in November, nearly three years after the last refresh. Here's a roundup of what we're expecting from the next version of Apple's small form factor tablet, based on the latest rumors and reports. Design and Display The new iPad mini is likely to retain its compact 8.3-inch display and overall design introduced with...
They’re getting to a point where people can hold onto their iPhones for 10 years. If I’m a shareholder, I’m asking what Tim is doing to replace the lost revenue from iPhone users who aren’t upgrading?
I charge my phone overnight, to 100%, every day ... don't care about battery health/lifespan. Its a consumable, when it doesn't meet my needs anymore it gets replaced
You're reducing the accumulation/creation of dendrites.
Dendrites are crystal-like formations in the cell that grow through the electrolyte, little by little, with each charge and discharge cycle. They cause short-circuit in a cell when they grow all the way through. This is the main way a li-ion cell dies.
Dendrites are formed primarily during deep charging and deep discharging. E.g., when you discharge the battery down to 0%, and when you charge the battery up to 100%. If you stay within the 20%-80% charge range all the time, a modern lithium ion cell can last probably 10x as many cycles compared to a battery that is cycled between 0% and 100%. But staying in that narrow range sacrifices 40% of the battery capacity, so it's pretty undesirable. Indeed, everything about battery design is balancing competing interests and picking 2 of 3 options.
Most battery controllers don't let you go to 0% anyway. When your phone is reporting 0%, it likely really means the battery has 1-3% left but for self-preservation it's not going to let the device turn on in that state. And most folks don't discharge their phone all the way daily anyway - it's a rare occurrence to be plugging in a totally dead phone. But most battery controllers let the battery charge to 100%. So dendrites slowly form.
By limiting the charging to 80%, you're greatly reducing/slowing the formation of dendrites.
But 80% is a bit aggressive in my opinion. Dendrite formation becomes a real problem at the extremes. 90-95% charge limit would be fine I think.
This is looking more and more like something in the hardware of the iPhone 15 models that allows the charging limits as well as this new feature. Maybe something controlling the USB C port or the battery controller itself?
All existing devices since iPhone 6S can do Optimized Battery Charging, which delays charging past 80%. All iPhones can pause charging when high temps are experienced. So we already know existing hardware is capable. This is confirmed by the fact jailbreaking can re-enable this artificially locked feature on iPhone 14 and older. This is a case of pure feature rationing.
