Hi Bertrand,
No probs for the questions, thats what Ice in space is for.
Yes everything is there for a fully functioning scope and any 12 volt battery will do but I use a one of
these from Super Cheap Auto as it has the 12 Volt Cigarette socket that the power lead fo rthe scope has (these are pretty much standard for goto powered mounts).
As for other details the mount is a
Sky Watcher EQ3 mount (Black in Colour not white as per the web site) I purchased the Goto kit for the mount as an extra as it made learning the night sky a bit easier for me (personal preference).
The scope is a
Maksutov Cassegrain (the one pictured is the newer series from Sky Watcher but still the same scope). It is a 127 mm Aperature scope with a focal lenght of 1500mm (F12) so is ideally suited to Planetary or deep space objects such as galaxies and Planetary Nubula.
The Goto system as mentioned was an add on to the mount and includes the SynScan controller, both motor axis and all cables etc required to operate the system, it can be connected toa computer as well if you wanted to control the mount via a PC. It includes an auto guider port as well but I have not tried long exposure photography on this mount only planetary video and visual work but really loved using it and got me well and truly hooked in Astronomy.
It came with the diagonal and eye pieces but these are not high end parts, they do the trick however

and if you have a dob you may well have some other eye pieces to use with it. I found the native magnification quite high so a long focal length eye piece was the best experience for me when viewing.
The case is a rugged case from super cheap that I decked out with foam lining and cut out the layers to fit it all in one case (except for the silver case of accessories), as this made it easy to transport.
I think that about covers it but please feel free to ask more questions if you have any, I am happy to email you more pictures if needed also as I know it can be hard to purchase sight unseen.
Cheers
Anthony