Apple’s battery supplier has registered two new battery cells believed to be for the company’s foldable iPhone, according to a prolific Chinese leak.
In a Weibo post, the leaker known as Digital Chat Station said the two cells had rated capacities of 1,921 mAh and 2,962 mAh, for a combined minimum rated capacity of 4,883 mAh. “The supply chain is also predicting a total battery capacity of 4,800-5,000 mAh, although this has yet to be confirmed,” the source added.
If accurate, the dual-cell design would be in line with existing book-style foldable smartphones, which typically split the battery between the two halves of the device. In terms of comparison to competing foldables already on the market, the Google Pixel 10 Pro Fold has a total battery capacity of 5,015 mAh, while the Samsung Galaxy Z Fold 7 has a capacity of 4,400 mAh. For comparison, the iPhone 18 Pro and iPhone 18 Pro Max are said to feature 4,288 mAh and 5,567 mAh batteries, respectively.
The leaker’s claim appears to contradict an early rumor suggesting Apple was testing a significantly larger 5,400 mAh to 5,800 mAh battery for its first foldable iPhone. That report described a technical test setup, however, so it’s possible that Apple has since revised the design. Either that or the rumor was false.
A rumor from March 2025 claimed that Apple had focused heavily on improving energy efficiency while slimming down key components of its foldable iPhone, with battery life seen as a key priority for the company. Separately, Apple analyst Ming-Chi Kuo said that the device will use high-density battery cells.
Apple’s foldable iPhone is rumored to feature a 7.8-inch inner display and a 5.5-inch cover display, as well as Touch ID instead of Face ID, an A20 chip, and Apple’s C2 modem in some countries. The device is expected to be revealed alongside the iPhone 18 Pro models in September. Apple’s book-style foldable could launch under the name ‘iPhone Ultra’, as reports suggest. IDC predicted that the average selling price for the foldable product would be $2,500, with storage options reaching up to $3,000.
