Sony 50P Operating Instructions Manual page 33

To remove the battery pack
3
Slide the BP-L40(A)/L60A/L90A so that the battery connector
connects to the battery connector of the unit. Continue to slide the BP-
L40(A)/L60A/L90A in until it clicks firmly into place.
With the lever pushed in, slide the BP-L40(A)/L60A/L90A in the direction
of the arrow (see figure).
Lever
33
Chapter 2 Preparations (GB)