Overview
- Apple uploaded an EU energy label that lists the iPhone Duo’s total battery capacity as 4,883 mAh made from two cells of 2,962 mAh and 1,921 mAh, formally confirming prior leak reports.
- The energy label is a regulator-filed specification, which matters because the Duo is eSIM-only and so the published capacity should apply to all units worldwide without a smaller physical-SIM variant.
- Apple’s lab-based runtime estimates on the label show 44 hours of video playback on the outer display and 31 hours on the inner display, reflecting higher power draw when the larger inner screen is used more.
- The 4,883 mAh battery places the Duo between the iPhone 18 Pro (4,288 mAh) and iPhone 18 Pro Max (5,567 mAh), making it one of the larger iPhone batteries while still trailing the top Pro Max model.
- With preorders open and limited walk-in stock expected at launch, the official capacity and the inner-versus-outer display tradeoffs will shape early buyer decisions and how stores allocate large demo units on release day.