I think I never have a problem because the battery grip. Sometime I forget to switch off the camera before change the battery (don't follow) and I don't have error on the card, at least not yet error.
On the other side, the battery grip keep the camera colder and less error on long operation (time lapse, etc). I use on T2 or 550D.
On the other side, the battery grip keep the camera colder and less error on long operation (time lapse, etc). I use on T2 or 550D.