Stacked batteries could let iPhone 15 go longer between charges


iPhone 11 Pro Max teardown
A new type of battery could give the iPhone 15 the longest battery life yet.
Photo: TechInsights

Apple will put batteries that could last up to 10% longer in the upcoming iPhone 15 series, according to an unconfirmed report. These will be stacked batteries rather than wound ones.

iOS handsets already offer lengthy times between recharges, but surely no one will complain about extending that.

Improving iPhone battery life with stacking

RGcloudS, best known for Android rumors, claims via Twitter that the entire iPhone 15 line will make the switch to stacked batteries.

If true, it will give Apple batteries that hold more power without taking up additional space. Or make batteries with the current capacity that are less bulky.

Batteries can also be safer. If one of the stacked cells has a problem, it can be shut off while the remaining cells continue to work.

The iPhone 15 series is expected to be announced then launch in September. Details about the stacked batteries — if this unconfirmed report is true — will presumably come out then. To learn more, read our “What to expect from the redesigned, faster iPhone 15.”

Stacked batteries vs. wound batteries

Currently, the batteries used in iPhone and other Apple devices are wound. Long sheets of a cathode, separator and an anode are rolled up then inserted into a rectangular casing to form a cell.

The experts at Bonnen Battery describe the alternative: “The stacking process is to cut the cathode and anode sheets into the required size, then stack the cathode sheets, separator and anode sheets into small cell unit, and then stack the small cell unit to form the final single cell.”

And Bonnen also says, “Lithium-ion cell products formed by stacking have a higher energy density, a more stable internal structure, a higher level of safety, and a longer life span.”


Daily round-ups or a weekly refresher, straight from Cult of Mac to your inbox.

  • The Weekender

    The week's best Apple news, reviews and how-tos from Cult of Mac, every Saturday morning. Our readers say: "Thank you guys for always posting cool stuff" -- Vaughn Nevins. "Very informative" -- Kenly Xavier.