No it doesn't...at least I haven't noticed and I always use my little buddy the kickstand
I got the extended battery a couple weeks ago and I love it! I never worry about HAVING to keep it on the charger all day long. I actually just started using the standard battery again so that I can use the car dock, but I just couldn't stand how fast the battery drained. I went back to the extended battery and am worry free again. I'm sure I can tweak the settings on my phone to get a little better battery life from the standard, but I like the way everything is set. I also agree with what others have said, I like the feel of the phone in my hand with the extended battery, I have a better grip. My issue right now is that I'm trying to find a good car dock that will allow the extended battery. I actually found a YouTube video that shows a guys modifying the oem car dock to allow the extended battery. I might give it a try.