Battery grips on cameras...

 Lots of people use a battery grip on their camera, indeed they are really handy. You have the portrait shooting shutter button and the advantage of usually holding 2 camera batteries.
 There is a downside though.  If you use your camera on a tripod with a hefty lens on take care.
 I had to strip down a battery grip for a friend after it packed up. The two things I noticed were A. the amount of circuits and chips inside the thing, and B. the tripod screw that hold the grip to the camera is actually held on to the top of the grip with four TINY grub screws. It wouldn't take much force to rip the grip /camera connection off the grip. Dropping a possibly expensive camera on the floor.