When I picked up my D300 I also bought the battery grip, as I mentioned in a previous post my primary reason for buying it was the ability to be able to use AA batteries if need be. I also bought a spare battery for the camera which also fits into the grip so when it came in I of course tried it out.
When you buy the grip it comes with two battery holders, one for the same type of battery the D300 takes, and one that holds 8 AA batteries. Also of note is that the grip is able to boost the frame rate of the D300 from 6 frames per second to 8 frames per second but there is a catch.… Click here to read more!