Upload & Sell: Off
First of all, Many thanks to each of you for your comments. they have woken up my other brain cell and clarified the process somewhat.
@cpueq: I have only produced a couple of timelapse, the longest runs to 2 minutes.
In reality, I am a complete tyro to t/l but learning fast - I have yet to figure out the best/recommended fps et al. No, I have no intentions of shooting the sun!
@ EB-1: OK, that has made me thing closer to the camera's mechanics. Because of locking up the mirror when sensor cleaning, I was assuming that the sensor was exposed. I was not even thinking of the 'shitter' ( ) being closed...
1) I wasn't even thinking right - of course, it wouldn't give me 7000+ frames on one battery. The video I link to was shot over two days @ approx 1 minute per day. I cant remember the actual frame rate I created it with.
2) I have just re-read the manual re mirror lock up - It would appear that when set via (C.Fn) the mirror lock up is a two stage affair. One press of the shutter button locks up the mirror. A second pressing of the shutter button takes the photograph and the drops the mirror... Not what I needed...
So, I need to revisit my maths and think things through a bit more...
I do have a pair of Canon A610s strapped together for stereo photography. Maybe cputec's suggestion is the better option.
I don't even think of T/L with my 5DMK2!