iPhone 18 Pro Max Battery Is 5,391 mAh, iPhone 18 Pro 4,056 mAh in EU Labels
Apple published the EU energy labels for the iPhone 18 Pro and iPhone 18 Pro Max on Thursday, and they carry a number Apple never prints in its own spec sheets: battery capacity. The iPhone 18 Pro holds 4,056 mAh and the iPhone 18 Pro Max 5,391 mAh, one day after both phones were announced.
Those figures cover the European versions, which ship with a physical nano-SIM tray alongside eSIM. The same labels also confirm 12GB of RAM in both Pro models, unchanged from last year.
The Pro Max got the upgrade. The Pro barely moved.
Set against last year's phones, the split is stark. The iPhone 17 Pro carried a 3,988 mAh cell, so the 18 Pro adds 68 mAh — a rise of about 1.7%, small enough that most owners will never notice it. The iPhone 17 Pro Max carried 4,823 mAh, so the 18 Pro Max adds 568 mAh, or roughly 11.8%.
Published percentages for the smaller phone have varied between write-ups, with figures as low as 1.45% in circulation. The arithmetic on Apple's own published numbers gives 1.7%.
Capacity is not the whole battery-life story — the A20 Pro's efficiency and iOS 27's power management both feed into Apple's screen-time claims — but it does explain why Apple rates the Max for longer runtime than its smaller sibling. We covered the A20 Pro's first benchmark scores earlier this week.
Buy one outside the EU and you get a bigger cell
This is the part worth understanding before you compare numbers with someone in another country. Apple sells the iPhone 18 Pro and Pro Max without a physical SIM slot in Bahrain, Canada, Guam, Japan, Kuwait, Mexico, Oman, Qatar, Saudi Arabia, the United Arab Emirates, the United States and the U.S. Virgin Islands. Removing the tray frees interior volume, and Apple fills it with battery.
So the eSIM-only units hold more than 4,056 and 5,391 mAh. How much more is not yet official: Apple only has to publish energy labels in the EU, and it has not confirmed the eSIM-only capacities anywhere else. Regulatory filings circulating before launch pointed to roughly 4,288 mAh and 5,567 mAh, but treat those as unverified until Apple or a teardown confirms them.
What the rest of the label actually says
The energy label is a scorecard, not just a capacity readout. Both Pro models come back with:
- A for overall energy class, the top grade
- B for drop resistance
- C for repairability
- IP68 for dust and water resistance
- At least 1,000 charge cycles before capacity falls below 80% of new
That cycle rating is the most practical line on the sheet. At a full cycle a day it works out to a little under three years before the battery is expected to drop under 80%, which is the threshold iOS uses to suggest a replacement in Battery Health.
How to find the label yourself
The label is not buried in a regulator's database. Open the iPhone 18 Pro or iPhone 18 Pro Max page on Apple's online store in any EU country and scroll to the energy section near the technical details; the label and its product information sheet are linked there as PDFs. Switch the store's country to a non-EU one and the section disappears, because no other market requires it.
Anyone shopping the wider lineup should note the same labels exist for the rest of the range, including the foldable iPhone Duo, which shares the A20 Pro. Apple's camera changes on the Pro models were visible in iOS 27 code ahead of the announcement.
Frequently Asked Questions
What is the iPhone 18 Pro battery capacity?
The iPhone 18 Pro has a 4,056 mAh battery in the European version that includes a physical SIM tray, according to the EU energy label Apple published on 10 September 2026. That is 68 mAh more than the iPhone 17 Pro's 3,988 mAh cell, an increase of about 1.7%. Models sold without a SIM tray hold slightly more.
How big is the iPhone 18 Pro Max battery?
The iPhone 18 Pro Max is rated at 5,391 mAh on its EU energy label, up from 4,823 mAh in the iPhone 17 Pro Max. That is a gain of 568 mAh, or roughly 11.8%, and it is by far the larger year-on-year jump of the two Pro models. Apple does not list battery capacity in its own technical specifications.
Why do eSIM-only iPhones have bigger batteries?
Removing the physical nano-SIM tray frees up interior space, and Apple uses it for extra battery. eSIM-only iPhone 18 Pro and Pro Max units are sold in Bahrain, Canada, Guam, Japan, Kuwait, Mexico, Oman, Qatar, Saudi Arabia, the United Arab Emirates, the United States and the U.S. Virgin Islands. Apple has not published capacities for those versions because energy labels are only required in the EU.
How much RAM does the iPhone 18 Pro have?
Both the iPhone 18 Pro and iPhone 18 Pro Max carry 12GB of RAM, which the EU product information sheets confirm. That matches the iPhone 17 Pro generation, so there is no memory increase this year despite the move to the A20 Pro chip.
How long will the iPhone 18 Pro battery last before it needs replacing?
The energy label rates both Pro models for at least 1,000 full charge cycles before capacity drops below 80% of new. At roughly one full cycle a day that is a little under three years. iOS flags 80% in Battery Health as the point where a replacement is worth considering.
