To confirm what HandyMac and colmcostelloe found, some MacBooks have one 3mm and two 4mm screws in the rear wall of the battery compartment. On the one I worked on, the shorter 3mm screw came from the middle hole.
Once they have, you'll be able to view a graph of their reputation gained over time.
Here's a preview of what the graph will look like:
No reputation gained yet.