IBM Thinkpad 600 Type 2645 broken connection to CMOS battery?

I have broken the connection off the motherboard when trying to replace the CMOS battery. Does anyone know how to fix it? Do I need a new motherboard? Can I just solder the connection back on? How do I get into that part of the thinkpad as there is a part of the case and another arm covering it. I have taken out all the screws I can see but still cannot open it up? Any help would be appreciated. Not very hands on but might as well try it before it goes out the window!!!