What would cause my car not have any juice? I just replaced the battery yesterda

Sounds like you have a connection problem at the battery.

Check battery connections, ground connection at battery and the fuse links, I've seen people accidentally blow a main fuse when changing the battery.

Sounds like your fusable link may be shot. Follow the lead from the alternator back to the main engine fuse box or follow the red wire from the battery back to same location. These 2 wires meet at the fusable link which is usually located on the side in a small compartment on the main engine fuse panel. If it is burnt out (it is usually covered so you can't see if it is) usual symptoms are battery goes dead. Jumping the battery will restart the car but the battery will just drain out again. To test: After charging battery use a voltmeter and touch black to black on battery and red to red with car off. Then touch black to battery and red to wire connecting at the alternator. Volts should be about equal. If reading is 0 fusable link needs replaced. This is the only link between alternator and battery causing inability to recharge. If you get a read equal to battery alternator is probably bad.