Apple’s upcoming iPhone 18 Pro Max could arrive with a thicker and heavier design, as new rumors point to a bigger battery inside the next flagship model. The change suggests Apple plans to improve battery life, but users may feel the difference in hand.
Chinese leaker Ice Universe claimed that the iPhone 18 Pro Max will measure around 9mm thick and weigh about 240 grams. That would make it around 0.25mm thicker and roughly 7 grams heavier than the current iPhone 17 Pro Max.
Bigger Battery Could Be the Main Reason
The rumored size change appears linked to the larger battery expected inside the iPhone 18 Pro Max. Recent filings suggest the phone could feature a 5,391mAh battery in China and a 5,567mAh battery in the U.S., giving it a notable increase over the iPhone 17 Pro Max.
Apple is also expected to use a new stainless steel vapor chamber for better heat control, and that internal change could add extra weight along with the larger battery.
The iPhone 18 Pro Max could become one of Apple’s heaviest iPhones if these details turn out to be accurate.
Expected changes include:
- Around 9mm thickness
- About 240 grams in weight
- Larger battery capacity
- Better thermal management
- Slightly bulkier in-hand feel
Apple is expected to launch the iPhone 18 Pro and iPhone 18 Pro Max this September, along with its first foldable iPhone.
