I'm not familiar with your pedals but some battery connectors are attached to the board with screws or rivets. Try jiggling the connectors a bit. Also try connecting plugs to the input and output of the pedal. Some pedals don't work if there is no input and/or output plugged into it. You may have also left the adapter plugged in when you connected the battery. If you haven't used a battery in a long while, try cleaning the contacts with alcohol. If there's rust or dirt crud in there, scrub it off with a scouring pad then clean with alcohol.
Good luck!