going from 5volt 1A to equivalent from a 3V CR2 Battery
1) Check to see if the NTE1904 can operate off of a 5V supply -> if not you need a LDO (Low Drop Out)

2) make sure it's not over heating and cutting out.  (5-3)[v]*1[A] = 2W -> heat sink.

3) Batteries are really good at handling peak currents, so the start up inrush current may be too high for the device.  That means you may have to use a device that can put out more current than the nominal rating. -> if you have a scope and current sensing resistor you could capture that.

Those are the three big things to look for.