After pre-orders for iPhone Duo opened, Apple uploaded an EU regulatory document that finally revealed the true battery capacity for iPhone Duo: 4883mAh. Here’s how that compares to other iPhones.

4883mAh definitely falls towards the high-end of the battery spectrum, though it’s by no means the best.

iPhone Duo features two battery cells: one 2962mAh and another 1921mAh cell, totaling 4883mAh. This places it pretty much exactly in between the iPhone 18 Pro and iPhone 18 Pro Max, which offer 4288mAh and 5567mAh batteries, respectively.

iPhone Duo battery comparison

Compared to the rest of the recent iPhone lineup (eSIM versions, which feature larger battery cells than the physical SIM versions), here’s where iPhone Duo ranks:

Capacity Difference Video Playback Hours (from Apple)

iPhone 18 Pro Max 5567mAh +14% 45 hours

iPhone 17 Pro Max 5088mAh +4% 39 hours

iPhone Duo 4883mAh – 44 hours on outer display

31 hours on inner display

iPhone 16 Pro Max 4685mAh -4% 33 hours

iPhone 18 Pro 4288mAh -12% 36…