"About time" is my favorite movie. It's about time travel. And it have some incosistencies about mechanics of how it work. But I don't see it as mistakes.
I choose to belive that this is "lost in translation". I'm not able to time travel. I don't have the capability to understand it. So they have to metaforized it down for me.
Telling someone who can't see that the "blue is like a cols water, yellow is like a sanshine on your face and red is lime rage or intense love" would work for the purpose of the story you are telling them. But its not ideally accurate.



The entire reasoning behind this change was that it would look cool to hold the battery in the explanation scene.