Heh, I'm glad I'm not the only one who has some difficulty with them.
I certainly do tend to drag out Battle scenes a tad too much sometimes. For example the Aqua vs Sephiroth battle I originally intended to be three chapters long, but then I realized that this would leave not enough room for the battle with the Heartless Army and lengthen die whole Story uneccessarily.
With emotional scenes, while I do love making them I also have always this fear in the back of the head that I either write the scene too bland, having the reader not feel with or for the characters, or writing it too intense so that it becomes unrealistic.
In terms of realism, I also tend to plan out some things far in advance. For example Ventus going to sleep at the end of chapter 11. The obvious seeable reason is that he really went through a lot with these additional, horrid pain seizures and new wounds inflicted accidentally by Roxas on his heart, but there's also another reason for later. In the state Ven is at the moment in chapter 11 he's practically not able to do anything of significant substance. However, in later chapters Ven needs to do something so while I can't make his heart heal for obvious reasons, I can still let him recuperate to an energy level where he (barely) can do the task he needs to do.
Uh yeah, I know, that's why I try to avoid havingg to make a quick transition between a fight and an emotional scene.