It's a round silver disc shaped battery similar to one in a calculator or other small devices. Theres a tiny clip that you have to pull back and it will release one side of it up and you just pull it out.
Took everything out and rebuilt it again, but it still does the same thing-this time thought, it starts for 2 seconds, slowly shuts off and then theres ONE BEEP, turns back on and then another beep and stays on. The fans seem to be at normal speeds but theres no picture. So my problems are still evident-it shuts off and then on when I try and power it and there is no image on the screen...tried swtiching the ram again and i tried the 650w psu again but it still didnt work..