Thanks for the reply, I fixed it in the end, it was not splitting the case I had a problem with, it was getting the bracket back on the side of the case. I had already taken the bracket off and replaced the batt, of course now I know how it goes I know I did not need to take the bracket off the side.
I took the batt and case out again and then disconnected all the wires from the bracket. Once I had the batt case and the bracket out of the dark hole it was easy to see how to clip it back on.
There are two tabs at the bottom of the bracket, they slide behind the bottom bar of the batt case, then you have to pull (hard) the top of the bracket (where the white module connector fits) up and over the top of the case, so that the clip locks into the batt case.
I would have taken pics if I had thought of it at the time sorry, if I every have to do it again I'll take pics...
thanks!