Kodak DC40 - Manual (Page 10)

6 January 1996
As you are installing each battery, first insert the negative (flat) end
into the recessed area toward the back of the camera, and then push
the positive end into place.
NOTE: The batteries fit snugly.
4. Insert the top pair of batteries with the positive ends (the ends with a
bump) toward the back of the camera.
As you are installing each battery, first push the negative (flat) end
against the metal tab toward the front of the camera, and then push
the positive end into place.
5. Place the battery compartment cover into its track and then slide it
back until it clicks into place.