iPhone Duo Battery Capacity Confirmed at 4,883mAh
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Apple's EU energy label confirms a 4,883mAh dual-cell battery for iPhone Duo, plus 51.5-hour standardized endurance and 1,000-cycle durability.
Apple's first foldable iPhone now has a confirmed battery capacity. A European Union energy label published before the iPhone Duo's October 23 retail launch lists 4,883mAh, providing an official figure for Apple's dual-battery design.
The distinction matters: Apple often promotes battery-life estimates rather than milliamp-hour capacities, and a foldable's two displays can produce very different endurance results.
What the EU Energy Label Confirms
The regulatory documentation for the iPhone Duo (model A3720) lists a combined 4,883mAh lithium-ion battery. Reports identify two cells of 2,962mAh and 1,921mAh, which together equal that figure.
The label reports 51 hours and 30 minutes of standardized battery endurance per cycle. This is a laboratory rating, not a promise of 51.5 hours of ordinary use. Brightness, cellular conditions and whether the larger inner screen is open will affect results.
Battery durability is rated for at least 1,000 charging cycles under the applicable EU methodology. The cycle rating concerns long-term battery health; it is not an estimate of hours per charge.
Why the Folding Screens Matter
The iPhone Duo combines a 5.4-inch outer display with a 7.6-inch inner screen. Capacity alone does not indicate how long it will last with either display in use.
Apple's quoted video-playback estimates, reported by 9to5Mac, are up to 44 hours on the outer screen and 31 hours on the inner screen. These are manufacturer test figures and should not be equated with the EU's 51-hour, 30-minute rating.
For context, reported capacities for eSIM-only versions of the iPhone 18 Pro and iPhone 18 Pro Max are 4,288mAh and 5,567mAh. The Duo sits between them in capacity, but that does not establish how their real-world endurance compares.
Is the Capacity the Same Worldwide?
The iPhone Duo is eSIM-only globally. That means there is no separate physical-SIM version known to require a different battery layout, making the 4,883mAh figure relevant to international listings.
What Buyers Should Know
The official label settles the capacity question before the phone reaches customers. It does not settle how much battery life heavy inner-screen multitasking will consume, how fast the phone charges from empty to full, or how well the two-cell system ages outside a laboratory.
