Apple's upcoming foldable iPhone will feature two batteries, as revealed by iOS 27 beta code. This dual-battery design allows for independent cell health monitoring and replacement. Supplier documents indicate a combined battery capacity near 5,000mAh for the device. The foldable is expected to launch alongside the iPhone 18 Pro in September. This new device will significantly impact the foldable smartphone market's value.

iOS 27 beta 4 arrived today, and per Macworld it includes code references to what’s likely a new iPhone Ultra feature: dual batteries.

New code in the latest iOS 27 beta references multiple batteries in one device, which signals that Apple is working on a foldable iPhone.