iPhone 13 battery details revealed in certification · 2 June 2021 · Rumour An unsubstantiated news story based on rumours, gossip, or hearsay that can't be verified by collaborating sources. Pocket-lint (Pocket-lint) - With Apple's iPhone 13 range expected for the usual September timeslot, rumours on the devices and their specifications have really ramped up lately. The latest isn't even a leak as such, as battery details have been posted as part of the official certification process in China. All devices need 3C (China Compulsory Certificate) certification to be sold in the country, and details are generally posted in official documents - often online. Therefore, designations believed to refer to the Apple iPhone 13 Pro, iPhone 13, and an iPhone 13 mini have been spotted in a listing, showing their battery sizes.