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The fourth developer beta of iOS 27 includes code strings referencing an iPhone with multiple batteries, discovered by Macworld. The strings mention "the batteries in this iPhone" and a single degraded cell being replaceable separately. The foldable iPhone Ultra, expected to debut this September alongside the iPhone 18 Pro, is rumored to use a dual-battery design with 1,921mAh and 2,962mAh cells totaling 4,883mAh.
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Summary by ByteBrief
iOS 27 speeds up iPhone in 30+ ways