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| The Apple iPhone Duo has a relatively small battery. |
Apple has quietly confirmed one of the most anticipated details about its first foldable iPhone through an EU energy label filing—and the news is a mixed bag for anyone hoping the iPhone Duo would set new benchmarks for foldable battery life.
According to the official product information sheet published by Apple, the iPhone Duo (model identifier A3720) ships with a 4,883 mAh battery. That's just slightly larger than the 4,800 mAh cell found in Samsung's Galaxy Z Fold8 (currently $1,699 on Amazon), but notably smaller than competitors like the Huawei Pura X Max (5,300 mAh)—despite the Huawei device matching the iPhone Duo's thickness profile.
Battery Endurance Falls Short of Apple's Flagship
The EU filing reveals the iPhone Duo achieves a battery endurance rating of 51 hours and 30 minutes per charge cycle. For context, that's over ten hours less than the iPhone 18 Pro Max, which packs a larger 5,391 mAh battery. It's worth noting that these EU-mandated endurance figures assume moderate usage patterns—real-world heavy users should expect considerably less screen-on time.
The energy efficiency class lands at A, which is respectable but doesn't tell the full story about how the foldable's dual-screen setup impacts actual power draw.
Battery Longevity: 1,000 Cycles to 80% Capacity
Apple states the iPhone Duo's battery will maintain at least 80% of its original capacity through 1,000 complete charge cycles. For users who drain and recharge their phone daily, that translates to roughly three years of service before noticeable degradation sets in.
When replacement time comes, Apple will charge $229 for the service—a figure that stings considering the device's premium price point. The battery is not user-replaceable, according to the EU documentation, though Apple's Self Service Repair program does provide access to genuine parts, tools, and manuals for those brave enough to attempt the procedure themselves.
Durability and Repairability: Mixed Results
The regulatory filing also confirms several durability specifications that Apple voluntarily submitted for EU compliance:
- IP68 rating for dust and water resistance (6-meter immersion depth)
- Class B drop resistance — tested to survive 140 falls in standard configuration, 35 falls in fully extended state
- Mohs hardness level 5 for screen scratch resistance
- 5 years of guaranteed security and functionality updates
- Repairability Class C with a score of 2.65/5
That repairability score deserves scrutiny. While the spare parts availability score is a perfect 5.00/5 (meaning parts are readily accessible), the software updates duration score sits at just 1.00/5, and tools score a mere 1.12/5. In plain English: getting parts is easy, but actually performing repairs requires specialized tools and navigating software locks that make independent fixes unnecessarily complicated.
The Foldable Trade-off
The iPhone Duo's battery situation illustrates the fundamental challenge Apple faces entering the foldable market. Samsung has spent eight generations optimizing its Fold lineup to achieve thinner profiles while maintaining competitive battery capacities. Apple's first attempt, by contrast, appears to prioritize other aspects of the experience—likely build quality, camera performance, or that rumored crease-free display—over raw battery numbers.
Whether consumers will accept a smaller battery in exchange for Apple's ecosystem integration and brand cachet remains to be seen. The iPhone Duo's real-world battery performance, particularly under heavy multitasking across both screens, won't be known until retail units reach reviewers.
What's clear from this regulatory filing is that Apple isn't reinventing the foldable battery wheel with its first attempt. The company is playing it safe with proven cell technology while presumably saving more ambitious battery innovations for future iterations.
The iPhone Duo is expected to ship in the coming months. We'll have full battery testing and real-world endurance results as soon as review units become available.
