I just finished replacing my EGR Valve on my 2000 Chrysler Sebring LXi. The car started fine before replacing the valve, but now, even after buying a new battery, I still have no electricity/power. I had to remove the battery to get to the EGR Valve. I think I had the battery disconnected to long (more than two days), causing the computer, alarm, something to disable my whole electrically/starting system. I need help. I will appreciate any ideas.

The only thing that relies on the battery is things like radio presets, alarms, error codes etc. Follow the battery leads and verify their connections. Ensure you have a good clean ground. You may have jarred them loose while changing your battery.