It is a bit of a bugger. Take the cover off the head lamp case to give yourself a bit of room.
You've done the right stuff so far. The bolt at the bottom is what holds it on.ÂÂÂ
If it's the same as my1.8 20v (not turbo), and I remember correctly, you've just got to lever the metal strap thing off the top of the battery (try pressing down the top - it is just hooked over the ridge on the battery)
I might be talking total cr@p, cos I can't see it right now ( I'm at work and my car is outside in the snow - no way I'm going out there unless I have to!! )