Need guide w/Pix replace CMOS battery Compaq pp2140

Hey guys, I have searched the topic but no relief yet. Does anybody have anything for me? Would like a guide with Pix if possible. Have experience building PCs but no experience tearing into a laptop. For example, where is the CMOS battery located on this model and what parts do I have to remove to get to it? And any tips/tricks would be greatly appreciated. Big Thanks! Royce