iPhone 18 Pro and Pro Max Battery Capacity Confirmed in Europe

Apple talked up big battery improvements when it unveiled the iPhone 18 Pro and iPhone 18 Pro Max, but true to form, it never mentioned an actual mAh number on stage. As usual, that job has fallen to European Union regulators and their paperwork has just given us our first hard numbers.

Key Takeaways

• iPhone 18 Pro (EU, nano-SIM version): 4,056 mAh
• iPhone 18 Pro Max (EU, nano-SIM version): 5,391 mAh
• The EU variant of the 18 Pro is actually smaller than last year’s eSIM-only iPhone 17 Pro (4,252 mAh) a drop of roughly 4.7%.
• Compared with the nano-SIM iPhone 17 Pro, the new battery is only marginally bigger (+1.44%).
• The 18 Pro Max tells a very different story: its EU battery is 5.78% larger than the eSIM iPhone 17 Pro Max and
• 11.12% larger than the nano-SIM 17 Pro Max — the biggest jump in the Pro Max battery in recent memory.
• S. units, which ship without a physical SIM tray, will likely carry slightly larger cells than the EU numbers above, following the same pattern set last year with the iPhone 17 line.

Why We’re Only Just Finding Out the Real Numbers

Apple has never been in the habit of publishing raw battery capacity on its spec sheets. Instead, it prefers to talk in terms of “hours of video playback” or “all-day battery life”  figures that sound reassuring but tell you almost nothing about the actual cell inside the phone.

However, what has changed here is regulation and not corporate disclosure. Starting June 20, 2025, all smartphones and tablets being sold in the European Union member states must be marked by an open Energy Label. This regulation has been enacted as a consequence of two pieces of European Union legislation interacting with each other: the Eco design Regulation (EU) 2023/1670 and the Battery Regulation 2023/1542.

Labels cannot just be empty marketing claims. Manufacturers have to disclose the following information in a mandatory fashion:

• The capacity of the battery (in mAh)
• The expected charge-cycle endurance (batteries should remain charged up to at least 80% of their initial state after 800 charge cycles according to EU regulation)
• IP rating of dust- and waterproofness
• Durability in drop tests
• The reparability of the device (on the scale of A – the best result – to E – the worst one – certified by the
• European Commission Joint Research Centre)
• Energy efficiency class

All phones that want to have a legal pathway to sales in the EU need to disclose this information prior to selling them. That is precisely the way why news portals got information about the capacities of the batteries of the new iPhones.

It should be mentioned that there is still more to come regarding the tightening of regulations by the EU.

Starting from February 18, 2027, there is another regulation according to which phones will be required to have replaceable batteries and a digital “battery passport” indicating its carbon emissions and materials composition.

This requirement is an additional one in comparison to the energy label requirement, and it reflects the path Brussels wants to push the industry towards.

iPhone 18 Pro and Pro Max Battery Capacity vs iPhone 17 Pro Lineup

Model Capacity (mAh) Change vs iPhone 17 Pro/Pro Max

• iPhone 18 Pro (nano-SIM, EU) 4,056 N/A
• iPhone 18 Pro Max (nano-SIM, EU) 5,391 N/A
• iPhone 17 Pro (eSIM) 4,252 -4.71% vs 18 Pro
• iPhone 17 Pro Max (eSIM) 5,088 +5.78% vs 18 Pro Max
• iPhone 17 Pro (nano-SIM) 3,998 +1.44% vs 18 Pro
• iPhone 17 Pro Max (nano-SIM) 4,823 +11.12% vs 18 Pro Max

A quick way to read this table: Apple builds two slightly different battery sizes for the same phone depending on whether it has a physical SIM tray. Removing the tray frees up internal space, which is why eSIM-only U.S. units have historically packed a bit more battery than their nano-SIM counterparts sold in Europe and elsewhere.

So Is the iPhone 18 Pro’s Battery Actually Any Smaller?

Well, yes — at least on paper and relative to last year’s eSIM-only iPhone in the EU. This is because the 4,056 mAh battery in the iPhone 18 Pro with nano-SIM is about 5% smaller than the 4,252 mAh battery in last year’s

iPhone 17 Pro with eSIM in the U.S.

Of course, the above comparison does not make full sense, because if Apple continues to follow its pattern and adds a slightly bigger battery to the eSIM-only version in the U.S. (as was the case with the iPhone 17 Pro), then the actual iPhone 18 Pro might actually have a battery of around 4,313 mAh.

The iPhone 18 Pro Max Is a Legitimate Improvement in Battery Life

However, the Pro Max gives a more definite account of its power capacity. With 5,391 mAh, its EU nano-SIM battery has more capacity than every version of the 17 Pro Max model:

• 5.78% increase from the eSIM iPhone 17 Pro Max battery (5,088 mAh)
• 11.12% increase from the nano-SIM iPhone 17 Pro Max battery (4,823 mAh)

Assuming the same calculation method, the eSIM only U.S. edition of the iPhone 18 Pro Max can have around 5,653 mAh of battery capacity — that is very unusual for Apple to have such a high-capacity cell. Normally, Apple uses smaller batteries in their phones than flagship models in competing Android devices such as the Galaxy S-series Ultra or Chinese flagships, making a significant step in battery capacity in Pro Max a noteworthy move on the company’s part.

Why Battery Capacity Alone Doesn’t Tell the Whole Story

One would think that mAh ratings give all there is to know about battery life, but here’s the thing — the number of mAh is just one parameter that influences performance:

• Chipset efficiency — while the capacity of the batteries is lower, the A-series chip in 18 Pro series is made on a more efficient process node compared to 17 Pro’s chip.
• Display technology — panel brightness and behavior of refresh rate as well as any additional improvements in LTPO impact the amount of power required.
• Software power management features — iOS background task management and performance management algorithms vary from year to year.
• 5G and other radio chips — historically, one of the most important sources of unnoticeable battery drain has been iPhone modems.

Therefore, even with lower-capacity battery than the previous model, a device can still offer same or even better screen-on time if the chipset and display are more efficient. This is exactly what Apple emphasizes in the keynote presentation instead of mAh ratings.

When Will We Get Confirmed U.S. Battery Numbers?

There is no equivalent of the European Energy Label regulation in the U.S., so American users will not receive the official capacity rating by Apple. This information is normally revealed through one of the following sources:

• Teardowns — websites such as iFixit normally release a complete teardown soon after the phone launches.
• Legal documents from other countries — certain organizations outside of the EU, including the 3C certification agency from China, sometimes share battery specs prior to the official teardown.

The iPhone 18 Pro and Pro Max will be available for purchase starting September 18, 2026, and therefore, it is expected that the hard information will be received in about one or two weeks after this date.

What About the iPhone Duo?

The iPhone Duo from Apple will not come out until October 23, 2026, and, therefore, will not face any EU energy labeling until the time gets closer to its release.

FAQs

Is the battery capacity of the iPhone 18 Pro greater than the iPhone 17 Pro?

No, because in the comparison between the EU nano-SIM and eSIM versions, it has 4.7% less capacity than eSIM iPhone 17 Pro, but it has only 0.54% more battery capacity than nano-SIM iPhone 17 Pro. It is likely that in the

USA the version will end up slightly better when the exact numbers are disclosed.

Is the battery capacity of the iPhone 18 Pro Max greater than the iPhone 17 Pro Max?

Yes. The exact battery capacity of the iPhone 18 Pro Max in the EU is 5,391 mAh, which makes it 5.78% to 11.12% greater than the iPhone 17 Pro Max’s battery.

Why do iPhones in the EU have a different battery size from the iPhone sold in the U.S.?

The iPhone sold in the U.S. does not have a physical SIM tray, which allows space that Apple could have used to add a bit of battery space. The iPhones sold in the EU region have the nano-SIM card, which leaves space for a slightly smaller battery.

Where do we get the battery capacities of EU iPhones since Apple has never stated anything?

Every phone sold in the European Union will need to display an Energy Label by June 2025 showing the battery capacity, longevity, reparability rating, among other things.