The main features of the iPhone 16 Pro Max include a 6.9-inch LTPO Super Retina XDR display, A18 Pro chipset, 8GB RAM, 256GB to 1TB storage, and a triple rear camera setup with 48 megapixels, including 5x optical zoom. It has a battery capacity of approximately 4685 mAh and is built with a titanium frame, weighing 227 grams. Battery health is 93%.