Apple spent three generations shaving grams off the Pro Max. It looks like that era is over.
Ice Universe, the Chinese leaker with a decent enough track record on dimensions, reckons the iPhone 18 Pro Max will land at roughly 9mm thick and around 240 grams. Compare that to the iPhone 17 Pro Max and you are looking at about 0.25mm of extra girth and something like 7 grams of extra heft.
Not a lot. But it is a direction, and the direction is backwards.
Where the Weight Is Going
It is the battery, mostly. Regulatory filings that surfaced earlier this week put the iPhone 18 Pro Max at 5,391mAh in China and 5,567mAh in the US, which works out to nearly 500mAh more than the current model carries. Physics has not been repealed. More cell means more space and more mass.
There is a second suspect, though. Apple is rumoured to be moving to a new stainless steel vapour chamber for thermal management on the 18 Pro. Stainless steel is not light. Neither is a bigger battery. Stack the two and 7 grams starts to look conservative.
The Heaviest iPhone Ever, Apparently
This lines up with a claim from last November that the 18 Pro Max would become the heaviest iPhone Apple has ever shipped. That title currently sits with the iPhone 14 Pro Max, which also weighed 240 grams. So if both numbers hold, we are talking about a record broken by an amount you would need lab equipment to detect.
Still, worth pausing on the arc here. Apple went titanium for the 15 Pro and 16 Pro and got a genuinely lighter phone out of it. Then it swapped titanium for aluminium on the 17 Pro, which should have made things lighter still, except the internals and a slightly chunkier chassis ate the savings. Now the 18 Pro Max is going up again.
Nobody Is Going to Mind
Here is the thing. Ask any Pro Max owner what they would trade 7 grams for and “meaningfully better battery life” is going to be near the top of the list. The thinness arms race has always been more interesting to Apple’s industrial design team than to the people actually carrying the phone around. And after the iPhone Air, a phone that led with thinness and mostly demonstrated what you give up to get it, a heavier Pro Max reads less like a compromise and more like a correction.
The iPhone 18 Pro and 18 Pro Max are expected in September, sharing a stage with Apple’s first foldable iPhone.
