iPhone Duo's 4,883mAh split battery ranks third among recent iPhones

European regulatory filings reveal the foldable iPhone Duo's combined battery capacity of 4,883mAh, split into 2,962mAh and 1,921mAh cells. That places it third among recent iPhones behind the iPhone 18 Pro Max (5,567mAh) and 17 Pro Max (5,088mAh). Apple rates up to 44 hours of video playback on the outer display and 31 hours on the inner one.

• Two cells: 2,962mAh and 1,921mAh, 4,883mAh combined
• iPhone 18 Pro Max has 5,567mAh, 684mAh more
• Outer display: up to 44 hours video, inner: 31 hours
• iPhone Duo is eSIM-only worldwide