Apple’s iPhone Ultra is shaping up to be one of the most talked-about phones in years, and the leaks keep coming. A new rumor out of China claims to reveal the exact battery configuration inside Apple’s first foldable iPhone, giving us one of the clearest looks yet at what to expect when the device lands in September.
According to 9to5Mac, leaker Digital Chat Station posted on Weibo that Apple’s battery supplier recently submitted a regulatory filing covering two batteries with capacities of 1,921mAh and 2,962mAh. Combined, that gives the iPhone Ultra a total battery capacity of 4,883mAh.
That detail matters because it points to a two-cell battery design, which is exactly how other foldable phones work. Samsung and Google both use split battery setups in their foldables to fit power cells around the hinge mechanism. It looks like Apple is following the same playbook.
To put 4,883mAh in context, here is how the iPhone Ultra stacks up against its main foldable rivals:
- Samsung Galaxy Z Fold7: 4,400mAh
- Google Pixel 9 Pro Fold: 4,650mAh
- Google Pixel 10 Pro Fold: 5,015mAh
The iPhone Ultra sits right in the middle of that range. It has more capacity than Samsung’s latest foldable but falls slightly short of the newest Pixel Fold. For a first-generation product, that is a reasonable starting point.
This leak also gives us a fuller picture of what the entire iPhone 18 lineup may look like on the battery front. Here is what the current rumors suggest:
- iPhone 18 Pro: 4,288mAh (eSIM) or 4,056mAh (physical SIM)
- iPhone 18 Pro Max: 5,567mAh (eSIM) or 5,391mAh (physical SIM)
- iPhone Ultra: 4,883mAh
Compared to the iPhone 17 generation, the Pro Max sees the biggest jump, gaining up to 568mAh depending on the SIM configuration. The Pro models see more modest bumps of around 36 to 68mAh. The Ultra, as a brand new product category for Apple, has no direct predecessor to compare against.
It is worth keeping expectations in check, though. Battery capacity is just a number. Real-world battery life depends on the processor, the software, the display, and how efficiently the device manages power across two screens. A foldable iPhone will have unique demands that no other iPhone has faced before, including powering a larger inner display and managing how the phone behaves when folded versus open.
Apple has not said a word officially about the iPhone Ultra. Everything here comes from a single leaker, and regulatory filings can sometimes reflect prototype specs rather than final production units. Still, Digital Chat Station has a reasonable track record on Apple hardware details, and the numbers align with what you would expect from a device in this category.
The full picture will only become clear when Apple takes the stage in September. Until then, these battery figures are the closest thing we have to confirmed specs for what could be the most significant iPhone Apple has ever made.