I bought a alienware m9700 for $100, but it has no battery and no harddrives

not worried about the harddrives because i can get them both with the bays for $80, but i need to buy a battery for $90 as well

now the trick part, when i plug the computer into the cord, it has no power, i think its because it has no battery in it, but idk, might need another motherboard as well?

the guy bought it from someone else like this for a project, but does not want the burden as he goes to ucf and does not have the time or money

im going to take it apart again, if anything ill part it out