iPhone Duo Battery Life Depends on Which Screen You Use

The iPhone Duo has what Apple is calling an "iPhone-first dual battery system" with one battery on each side of the device. Apple optimized physical space for battery capacity to make sure that the battery lasts as long as possible. When using the larger 7.6-inch inner display (unfolded), the battery lasts for up to 31 hours of video playback. If you're using just the 5.4-inch outer display, the battery lasts for up to 44 hours when watching video. With Apple's typical use metric, which includes equal use of both screens, the battery lasts for up to 24 hours. Typical use includes a mix of messaging, photo capture, listening to music, social app use, streaming video, playing games, web browsing, and navigation. Apple says it is based on median usage across iPhone users. The typical use metric for the iPhone Duo matches the iPhone 18 Pro's. The larger 7.6-inch display draws more power and eats more battery than the 18 Pro when watching video, while the smaller display gets better battery life. The ‌iPhone 18 Pro‌ Max has the longest battery life of the three iPhones at up to 45 hours. The iPhone Duo is able to charge to 50 percent in around 20 minutes with a 60W or higher USB-C power adapter. It includes support for MagSafe and can wirelessly charge at up to 25W using ‌MagSafe‌ or Qi2. The two batteries in the iPhone Duo are managed as a single battery by iOS. Apple says battery life was maximized through the two-battery design, eSIM-only design, C2 modem efficiency, and the new A20 Pro chip. Preorders for the iPhone Duo will start on October 16, with a launch to follow on October 23. Popular StoriesiPhone 18 Pro Prices Estimated Ahead of September 9 Apple EventThursday September 3, 2026 3:41 am PDT by Tim HardwickLess than a week before Apple debuts new iPhone 18 Pro models, research firm TrendForce estimated the prices of the devices based on the latest hardware cost environment. TrendForce's price estimates compared to last year's models look like this: Model Starting Price Model Starting Price Change iPhone 17 Pro $1,099 iPhone 18 Pro $1,24...Apple Event Today: iPhone 18 Pro and iPhone Duo Cheat SheetTuesday September 8, 2026 10:24 am PDT by Tim HardwickApple's biggest event of the year is almost here, and all eyes are on Cupertino. With the first foldable iPhone expected to headline Apple's "Surprise and Shine" event on Wednesday, September 9, at 10:00 a.m. Pacific Time, the rumor mill has been running full throttle, fuelled by the biggest single design change in the life of the iPhone. To get you up to speed, here's a quick reference...Foldable iPhone Ultra Likely Has MagSafe ChargingTuesday September 1, 2026 11:44 am PDT by Juli CloverApple's foldable "iPhone Ultra" will likely support MagSafe charging, Bloomberg's Mark Gurman said in an interview with Tom's Guide. iPhone Ultra dummy models that surfaced in April didn't include a MagSafe ring, while dummies of the iPhone 18 Pro did. Leaked cases for the device did have a MagSafe ring, making it unclear whether it would support MagSafe charging. "All indications that...