02-19-2018 02:32 PM - edited 02-19-2018 02:34 PM
With the transmitter unit off-camera short out either of the 2 side metal contacts with the centre pin contact of the foot with a piece of wire or a paper clip, if it is working then the led on top of the transmitter will flash briefly and the remote flash will fire. If this works then you will know that the unit is operating correctly and the fault must be that it isn't connecting properly with the camera shoe.
Are you sure that you haven't broken any wires inside the unit when you fitted the battery because that is very easily done.
If your unit is like this one with only one central pin on the foot then it is made to be used in manual flash mode only and ETTL control will not work.