Apple has published an EU energy label for the iPhone Duo that confirms the foldable's total battery capacity at 4,883 mAh, MacRumors reported on October 18, 2026.
The document appears to confirm a previous leak showing the iPhone Duo carries two cells of 2,962 mAh and 1,921 mAh, totaling 4,883 mAh. Because the iPhone Duo is an eSIM-only device, the figure applies to all versions worldwide - there is no physical-SIM variant with a slightly smaller battery.
For comparison, iFixit measured the eSIM-only iPhone 18 Pro at 4,288 mAh and the eSIM-only iPhone 18 Pro Max at 5,567 mAh, placing Apple's first foldable between its two conventional flagships on raw capacity.
The iPhone Duo is priced at $1,999 with pre-orders open ahead of the October 23 launch. The EU label is a regulatory disclosure, so the capacity figure is official; real-world battery life will depend on how the dual-screen design is used.
What to watch: independent battery tests once review units ship, and whether the dual-cell split affects charging behavior or repairability.