From working with the radio just prior to yours, if an incorrect code is entered too many times, it needs to be powered up ( key on and on button cycled ) for 24 hours to try coding again. ( It does not look at the clock display, it used elapsed time. )

There is a chance that when connecting the battery it sparked a few times and jammed the radio. An option would be to pull both fuses ( memory power that goes to the battery and accessory power that goes through the ignition switch. ) or unplug radio.

If this does not fix, you might just have to drive car for a few days.