I asked someone I know about this and they confirmed that a RAM upgrade would have a significant effect on battery life. Can't provide any citations of course.

I asked someone I know about this and they confirmed that a RAM upgrade would have a significant effect on battery life. Can't provide any citations of course. They also pointed out that iOS already artificially limits the amount of RAM a single process can use, so adding RAM wouldn't even really do anything besides make it take longer for background apps to be evicted.