The extended battery puts just a wee bit of extra stress on the standard battery door clasps, and at least one of those clasps tends to pop open (right side, opposite of USB port). I'm not overly concerned about the battery expansion. The expanded door allows just enough room to keep the door on firmly without the possibility of it unclasping anywhere.
That being said, I use my phone with the gel case, which does not allow for the extended door. Therefore, I use the standard door, the extended battery, and the gel case, which prevents the battery door from unhooking at any of the corners. I've had this combination of extended battery and standard door almost since day one, and I live in a hot desert state and haven't had any issues with the battery expanding and disrupting electronics within the phone. If that eventually happens, I'll just exchange it under warranty. Neall
