(Image credit: Foundry)
Everything about the iPhone Ultra is going to be scrutinized under a much larger magnifying glass, so Apple can’t afford to gloss over some of the foldable’s biggest rumored features. One of the greatest areas of concern centers on battery life, given that it’s tipped to become the thinnest iPhone ever.Delivering all-day endurance in a foldable is notoriously difficult, especially when you factor in that these devices have expansive main displays compared to traditional slates. I’ve tested many of the best foldable phones, and our lab testing reveals the obvious: battery life remains a major area of opportunity.Knowing that Apple needs to strike a careful balance between battery endurance and a thin, lightweight construction, I’ll break down all the leaks and rumors surrounding the iPhone Ultra’s battery — while examining what its main rivals offer in terms of stamina.Split battery design
(Image credit: AppleTrack)Based on regulatory filings released back in July and shared by leaker Digital Chat Station, Apple could be leaning toward a dual-cell split battery design for the iPhone Ultra to evenly distribute weight across its folding chassis. The configuration revealed in the filings pairs a 1,921 mAh cell with a larger 2,962 mAh one, bringing the total combined rated capacity to 4,883 mAh.Unlike many of its rivals, Apple isn’t planning to bank on silicon-carbon battery tech to power its upcoming foldable. While competitors leverage high-density silicon anodes that allow them to cram massive capacities into their foldables without adding bulk to their frames, Apple's decision to stick with conventional lithium-ion cells means the iPhone Ultra won't lead the pack in raw capacity.
