I just recently found a cosmo TB-3e safe and the batteries are dead. I pealed the sticker from around the touch pad and they were 5or6 screws under it. take only the 4 outside screws (the 4 corner ones) loose and remove the key pad. there is a ribbon plug with several brown wires, unplug it from the key pad and set it aside. take a stiff wire and bend a hook in it. insert it into the hole that the brown wires are in and try to pull out the two red wires, be careful not to break the wires. strip the wires and put a longer lead on each wire. (DO NOT cut the wires in two.)after you get the leads on plug the key pad back in and then take a 9volt battery and attach it to the leads. if the red LED light doesn't light up when you push the (C) button switch the contacts on the battery. the default code is (C123456#(pound sign). you will have 4 seconds to turn the knob to open the safe. the safe resets itself after 4 seconds opened or closed. Hope this helps anyone