iPhone Duo Battery Capacity Revealed: 4,883 mAh

Apple made its EU Energy Labels filing public, giving the exact battery capacity of the new two‑battery iPhone Duo – 4,883 mAh. That size is larger than the 18 Pro’s 4,056 mAh but still smaller than the 18 Pro Max’s 5,391 mAh. Earlier rumours had suggested the Duo would have the biggest battery of any iPhone, a claim that the filing confirms only partially. The filing also notes that the total capacity is split between a 2,962 mAh cell and a 1,921 mAh cell, but it does not detail how the power is distributed between the two.

Battery Capacity Figures

The two‑cell arrangement places the Duo just between the Pro and Pro Max models in the current lineup. The battery size translates to about 44 hours of video playback on the outer display, dropping to 31 hours when the larger inner display is used.

Real‑world Geekbench tests show that the Duo’s performance is almost indistinguishable from that of the 18 Pro. In single‑core benchmarks, the 18 Pro scores 3,390 while the Duo reaches 3,986, and in multi‑core tests the Duo scores 11,067 against the 18 Pro’s 11,540, well within the margin of error.

The EU energy label also lists video playback times, with the Duo achieving 44 hours on the outer display and 31 hours on the inner display, compared with 45 hours for the 18 Pro Max and 36 hours for the 18 Pro. These figures suggest that the Duo’s larger battery will give users a noticeable edge over non‑Pro models, though it will lag behind the Pro Max variants.