Well I finally got my DR-E5 DC Battery adaptor for my 450D.
Well errr it was not what I was expecting. It's designed for an AC input to convert to DC and is really part of the Canon ACK-E5 camera power kit.
I wanted just a battery adaptor I could put use with my own DC supply. I didn't want the AC/DC converter in the camera as it creates heat.
So...I am an Idiot.
Sigh...I just ordered qty 2 cheap LP-E5 replacement batteries from fleabay. I'll pull them apart to use in lieu.
So...have a laugh at my expense... but save some up as I'm sure to display more stupidity in the future.