According to Digital Chat Station on Weibo, one of Apple’s usual battery suppliers just had a pair of batteries certified together, which means they are intended for a foldable smartphone (since these have split batteries due to the form factor).

The batteries in question have a rated capacity of 1,921 mAh and 2,962 mAh, respectively, giving us a grand total of 4,883 mAh. This is rated capacity, which means the typical advertised capacity will be 5,000 mAh. So that’s most likely what the iPhone Ultra will boast.

iPhone Ultra speculative render

Interestingly, it’s on par with the rumored battery capacity of the Samsung Galaxy Z Fold8 Ultra, even though that has a different aspect ratio (it is in fact the successor to the Galaxy Z Fold7 from last year). Samsung’s direct iPhone Ultra competitor is the Galaxy Z Fold8, which is rumored to have a 4,800 mAh battery.

The iPhone Ultra is expected to be unveiled in September alongside the iPhone 18 Pro and iPhone 18 Pro Max. Despite some past rumors claiming it would be delayed, the latest reports all suggest it will arrive as scheduled.

Source (in Chinese) | Image source