SB-800 comes with a special battery booster that replaces the normal battery compartment door. It supposedly increases cycling speed. But installing it requires the removal or original battery compartment door. Nikon says just open the door, and push it past its normal 90 degrees limit, and the door will pop out. I pushed until the little plastic hings is starting to turn white, and about the break, and the door did not pop out. Anyone has any ideas?