The running time of the CD-ROM was designed to play Beethoven's 9th symphony in its entirety. You would have thought Apple would plan the battery life to allow you to watch all of Avengers: Endgame, or maybe Oppenheimer, without pausing to swap the battery.
I have to wonder about a device that won't allow you to watch a 2-hour movie without running out of battery and having to plug it in. I guess Oppenheimer is a no-go.