Model China Battery Change iPhone 16 Pro Max 4,685mAh +244mAh iPhone 17 Pro Max 4,823mAh +138mAh iPhone 18 Pro Max 5,391mAh +568mAh Model China U.S. iPhone 17 Pro 3,988mAh 4,252mAh iPhone 18 Pro 4,056mAh 4,288mAh iPhone 17 Pro Max 4,823mAh 5,088mAh iPhone 18 Pro Max 5,391mAh 5,567mAh The larger jump for the Pro Max also fits earlier reports that Apple plans to make the iPhone 18 Pro Max thicker than the smaller Pro model, giving the company more room for additional battery capacity.