I think he's asking how to access the battery in the laptop. Try this PDF:

ftp://ftp.pc.ibm.com/pub/pccbbs/mobiles/tpvol2.pdf

Hardware Maintenence Manual for Thinkpads.

Some Thinkpads are a pain in the arse to open. There aren't any screws on the bottom, you have to pop the bottom part off.