How do I get the battery cover off of my harley? 2004 Dyna lowrider.

On the earlier models, you remove the seat and look next to the frame behind the battery. There's a "jack screw" there. Look on the outside of the frame to the rear of the battery and you'll see two bolts. These are locking bolts. Loosen the two locking bolts and turn the jack screw counterclockwise. This should lower the battery tray.