Apple Watch Ultra's massive battery revealed in filings

Apple Watch Ultra
(Image credit: Apple)

The Apple Watch Ultra has an enormous 542mAh battery that fuels its 36-hour battery life, according to new filings for all of its new Apple Watch models. 

As reported by MySmartPrice, new filings have revealed the battery sizes of all five of its new Apple Watch models and their various sizes. They are as follows:

  • Apple Watch SE (40mm) - 245mAh
  • Apple Watch SE (44mm) - 296mAh
  • Apple Watch Series 8 (41mm) - 282mAh
  • Apple Watch Series 8 (45mm) - 308mAh
  • Apple Watch Ultra - 542mAh


One of the huge selling points of the new Apple Watch Ultra is its mammoth 36 hour battery life designed for constant use as you go out hiking on the trails or running in the mountains. The large battery is made possible thanks to the considerably larger 49mm case and a flatter design. 

The Apple Watch UItra is made from aerospace-grade titanium, features a Retina display and up to 2000 nits of brightness. 

Apple Watch Ultra also benefits from watchOS 9's new low-power mode, which is a feature coming to all Apple Watch models from the Series 4 onwards. the new low-power setting can extend the Apple Watch Ultra's battery life up to 60 hours, disabling some features like certain sensors and the always-on display. 

Apple Watch Ultra features new purpose-designed bands for the great outdoors including a new Trail Loop of lightweight woven textile, a new Alpine Loop band with two layers, and a new Ocean Band for extreme water sports and diving. 

Apple Watch Ultra is already available to order and will be released on September 23. The company also unveiled its new Apple Watch SE and Apple Watch Series 8, as well as its new best iPhones, the iPhone 14 and iPhone 14 Pro, and its AirPods Pro second-generation. 

Stephen Warwick
News Editor

Stephen Warwick has written about Apple for five years at iMore and previously elsewhere. He covers all of iMore's latest breaking news regarding all of Apple's products and services, both hardware and software. Stephen has interviewed industry experts in a range of fields including finance, litigation, security, and more. He also specializes in curating and reviewing audio hardware and has experience beyond journalism in sound engineering, production, and design. Before becoming a writer Stephen studied Ancient History at University and also worked at Apple for more than two years. Stephen is also a host on the iMore show, a weekly podcast recorded live that discusses the latest in breaking Apple news, as well as featuring fun trivia about all things Apple. Follow him on Twitter @stephenwarwick9