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Here’s how iPhone Duo’s battery capacity compares to other iPhones

Avatar for Michael Burkhardt  | Oct 18 2026 - 6:32 pm PT
2 Comments

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:

CapacityDifferenceVideo Playback Hours (from Apple)
iPhone 18 Pro Max5567mAh+14%45 hours
iPhone 17 Pro Max5088mAh+4%39 hours
iPhone Duo4883mAh–44 hours on outer display
31 hours on inner display
iPhone 16 Pro Max4685mAh-4%33 hours
iPhone 18 Pro4288mAh-12%36 hours
iPhone 17 Pro4252mAh-13%33 hours
iPhone 17e4005mAh-18%26 hours
iPhone 173692mAh-24%30 hours
iPhone Air3149mAh-36%27 hours

Overall, iPhone Duo has one of the largest battery capacities in an iPhone, only being bested by the two most recent Pro Max iPhones. Compared to anything else, the Duo will have a physically larger battery – though it’s worth noting that you’ll get less battery life if you use the larger inside display very frequently.

Are you buying an iPhone Duo? Are you excited to receive yours, or did you also have an unfortunate pre-order experience? Let us know in the comments.

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Avatar for Michael Burkhardt Michael Burkhardt

Michael is a 9to5Mac Reporter, leading all of our Apple news coverage on weekends and reviewing the newest Apple products and accessories. He got started in the world of Apple news during the pandemic, and it became a growing hobby. He’s also an indie iOS developer, and started the weekly Indie App Spotlight series, which has covered hundreds of blooming new apps since it launched. In his free time, he enjoys shooting street photography around New York City on his Sony A7RV.

Michael Burkhardt's favorite gear

Anker 25K Compact Battery Bank

Featuring two built in cables, a built in display, multiple ports, a 25,000mAh capacity, and up to 100W of output - this is one of the best battery banks for recharging your entire Apple ecosystem on the go.

AirPods Pro 2 (USB-C)

AirPods Pro 2 (USB-C)

Despite a new version reportedly being around a corner, I still personally believe AirPods Pro 2 are a great deal. They're already equipped with USB-C, and continually gain new software features. With them consistently going on sale, it's a great purchase to make. Features like Adaptive Audio are incredible.