In Blade Runner, the whole investigation pivots on an origami unicorn: a small, deliberate object left where the detective would find it, proof that someone understood the truth before he did. Apple has left its own unicorn inside iOS 27 developer beta 4, released on 20 July. Buried in the Battery Health code sit strings that refer, plainly and repeatedly, to "the batteries" in this iPhone. Plural. Every iPhone shipped across nineteen years of the product line carries exactly one battery. The Apple iPhone Fold, expected in September alongside the iPhone 18 Pro at an average price near $2,400 on IDC's projection, has begun introducing itself through the operating system.What Exactly Did iOS 27 Beta 4 Reveal?The fourth developer beta of iOS 27 contains Battery Health strings authored for an iPhone with more than one battery, and the wording is specific enough to map the service model behind it. One string states: "The batteries in this iPhone are performing as expected." A second warns that "the health of the batteries in this iPhone has significantly degraded." The third is the sleeper: iOS will inform the owner when "one of the batteries could not be verified as a genuine Apple battery."About The AuthorAt heart, I am a storyteller drawn to the watershed moments that bend the technology landscape. I braid narrative with data, humanise statistics, and trace the arc from first spark to world-changing impact. My reportage, features and reviews are witty, sardonic, visual and vivid, using anecdote to illuminate rather than eviscerate.