The first iPhone Duos will land in users’ hands at the end of this week, and it means we’ll finally get a chance to find out all the things we still don’t know about the phone. One thing we can cross off the list is the phone’s total battery capacity, thanks to the newly published EU energy label.
Under EU law, all phones sold in the region also need a publicly accessible energy label, which provides key details about the device in question. Alongside information such as IP rating, drop test performance and repairability, the labels also list the phone’s energy performance and battery specifications. In the case of the iPhone Duo, it confirms the long-standing rumor that the phone packs in a 4,883 mAh battery.
For reference, the eSIM-only variants of the iPhone 18 Pro and iPhone 18 Pro Max both have 4,288 mAh and 5,567 mAh batteries, respectively. Which means the iPhone Duo falls somewhere in the middle of the two.
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However, considering that this is a dual screen phone, one of which is almost 8 inches in size, it’s not entirely clear if the actual battery life will do the same. We’ll have to wait and see how the duo fairs in our own battery life test.
How the iPhone Duo’s battery compares to other foldables
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| Row 0 – Cell 0 | Battery capacity (mAh) | Battery life (hours: min.) |
iPhone Duo | 4,883 | N/A |
iPhone 18 Pro | 4,288 | 16:17 |
iPhone 18 Pro Max | 5,567 | 18:27 |
Samsung Galaxy Z Fold 8 | 4,800 | 12:50 |
Samsung Galaxy Z Fold 8 Ultra | 5,000 | 14:33 |
Google Pixel 11 Pro Fold | 4,806 | 12:31 p.m |
Motorola Razr Fold | 6,000 | 14:44 |
As you can see, the battery life of the iPhone Duo is no different than that of other foldables out there. It’s slightly below the Z Fold 8 Ultra, and slightly higher than the Pixel 11 Pro Fold, although both are full-size book-shaped foldables with a bit more room for larger batteries. As is the Motorola Razr Fold, which has a powerful 6,000 mAh battery inside.
The closest we have to Apple’s passport-shaped design is the Samsung Galaxy Z Fold 8, which has a slightly smaller 4,800 mAh battery.
This phone lasted just shy of 13 hours during the test, which can give us a benchmark of what to expect from the duo. Not only is Apple’s battery store an extra 83 mAh of power, it also has the same energy-saving features as the 18 Pro series – including the A20 Pro chipset and C2 modem.
I would expect the iPhone Duo to last a bit longer than the Z Fold 8 based on those two factors, but we can’t know for sure until we actually get it into Tom’s Guide lab.
Everything else the EU just revealed about the iPhone Duo
The EU energy label has also confirmed some other details. One of which is that the Duo’s battery is rated for 1,000 full charge cycles (zero to 100% and back), which means it should retain at least 80% of its total capacity for that duration.
The duo also lasted 140 free falls without causing problems, although that number dropped to 35 when with the screen fully open.
So as durable as it may be, the iPhone Duo is still much more fragile if you leave the inner screen open and exposed. By comparison, the Z Fold 8 and Z Fold 8 Ultra both lasted 210 drops, which dropped to 45 when opened, while the iPhone 18 Pro Max lasted 180.
As for water, the phone is IP68 rated (as expected) and is capable of being submerged in up to six meters of water. The screen is also listed as scratch resistant up to 5 Mohs on the hardness scale, compared to only one in the Z Fold 8 series. Since this is the same as the iPhone 18 Pro Max, which has a Ceramic Shield 2 display, my opinion is that only the outer display of the duo was tested.
The Duo’s repair index score of 2.65 is also lower than that of the other three phones. The 18 Pro Max scored 3.14, while the Z Fold 8 and 8 Ultra scored 2.79 and 2.78 respectively.
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