According to MacRumors, code in the fourth developer beta of iOS 27 contains references to an iPhone with two batteries. The newly discovered Battery Health strings mention multiple internal batteries, suggesting Apple may be working on a device with a different battery configuration than current iPhone models.
If a future iPhone ships with two internal batteries, apps that surface battery state or tune background work around charge level may need to handle multiple cells rather than a single percentage. Worth checking whether the existing battery APIs expose per-cell data or just an aggregate, since that determines how much actually changes for developers. For now this is a code-reference rumor, so treat it as a heads-up rather than something to build against.
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