Apple has not confirmed a foldable iPhone, but code found in the iOS 27 beta may offer a significant clue about its internal design. The software includes Battery Health references to multiple internal batteries in an unidentified iPhone model.
That detail matters because current-generation iPhones are reported to use a single internal battery. A dual-battery arrangement would be consistent with the physical constraints of a foldable device, whose internal space is divided by a hinge.
Macworld identified code strings using the plural term “batteries” in the Battery Health section. One message reads, “The batteries in this iPhone are performing as expected.”
Another message states that “the health of the batteries in this iPhone has significantly degraded.” Gadgets360 reported that the warning may appear when the battery health of the rumored iPhone Ultra falls below 80 percent.
A Different Battery Health System
The code is also said to cover a situation in which one of the batteries is not a genuine Apple component. This suggests Apple may be preparing battery-health management that can assess more than one power cell within the same device.
| Aspect | Current iPhones | Unidentified iOS 27 Beta Model |
|---|---|---|
| Battery configuration | One internal battery | More than one internal battery |
| Battery Health wording | No reported plural battery reference | Uses “batteries” and battery-condition messages |
The code does not identify the product by name, so it cannot confirm that the device is Apple’s first foldable iPhone. Still, the language aligns with a design that would need separate batteries on either side of a folding mechanism.
Why Foldables Commonly Use Two Batteries
A battery cannot bend in the same way as a flexible display panel. Foldable-phone makers therefore commonly split the battery system between the two halves of the chassis.
This approach can be used in book-style foldables as well as more compact clamshell models. It allows manufacturers to use the available internal space without interfering with the hinge and folding display.
The trade-off is that the device needs software capable of monitoring two batteries separately or managing them as a combined system. The iOS 27 beta wording is therefore viewed as a logical match for the requirements of a foldable iPhone.
Rumored iPhone Ultra Plans
Apple’s first foldable handset was previously widely referred to as the iPhone Fold, although more recent reports point to the iPhone Ultra name. It is expected to use a book-style folding format rather than a smaller clamshell design.
The device is expected to launch in September alongside the iPhone 18 Pro and iPhone 18 Pro Max. That timing remains an expectation rather than an official schedule, as Apple has not announced the device or its final name.
Other reported features include a vapour chamber cooling system for thermal management. Such a system could be important in a foldable body that must fit tightly packed components into two separate sections.
The inner display is also said to have a nearly invisible crease, or a crease-free appearance. Apple may obtain the foldable display panels from Samsung.
The iOS 27 beta does not reveal battery capacity, final hardware design, or the device’s official branding. However, its references to multiple batteries provide a notable software-level indication that Apple may be preparing a major change for its first foldable iPhone.
