Yes, the iPhone 13 Pro Max does have a ProMotion feature that can change the screen refresh rate to 120 Hz. This generally drains a lot of battery, thus affecting the overall battery life.
However, fortunately Apple has a solution to avoid this problem, namely by adjusting the refresh rate based on the type of content being enjoyed.
When you're opening an ebook that doesn't tend to require a lot of screen shifting, the refresh rate that is activated is only 10 Hz. However, when playing certain games that support high refresh rates, the active refresh rate is 120 Hz.
GSMArena said that the iPhone 13 Pro Max has a much improved battery life compared to the iPhone 12 Pro Max which was released in 2020. For example, when doing offline video playback, this phone can last for 24 hours, aka 9 hours longer than the previous generation.
The same source also stated that the endurance rating of this phone reached a score of 121 hours, higher than the iPhone 12 Pro Max (95 hours), Samsung Galaxy S21 Ultra 5G (114 hours), and Xiaomi Mi 11 Ultra (95 hours).
In terms of basic specifications, the iPhone 13 Pro Max packs a screen with a Super Retina XDR OLED panel that packs HDR10 certification and displays Dolby Vision quality standards. On the screen size of 6.7 inches, Apple provides a resolution of 1284 x 2778 pixels at an aspect ratio of 19.5: 9 at a density of 458 ppi.
When enjoying HDR content, be it photos or videos, the screen is able to provide brightness up to 1200 nits. Apple also claims that this screen provides 25% better brightness when used outdoors during the day.
According to GSM Arena lab tests, this device from Apple can reach a brightness level of up to 1050 nits in Auto mode, and this result is achieved when the screen is in the hot sun.
And when the brightness level is increased manually, the brightness level reaches 852 nits. As for the color gamut, Apple claims this cellphone displays colors on the DCI-P3 standard.
As previously explained, this iPhone 13 Pro Max screen also supports ProMotion 120 Hz which can vary the screen refresh rate between 10 Hz to 120 Hz based on the activity being carried out.
PCMag mentions that this adaptive refresh rate change is really noticeable when surfing using the Safari browser. It is mentioned that scrolling web pages feels so smooth on the eyes, providing a surfing experience that is twice as smooth as conventional 60 Hz.