Dell Latitude 3300 Owner's Manual page 64

5 Remove the single M2.0x3.0 screw [1] and remove the metallic bracket [2] retaining battery to the palmrest.
6 Remove the two M2.0x3.0 screws [3] and separate the battery support bracket [4] from the palmrest.
7 Lift the battery away from the computer.
64 Disassembly and reassembly