Ah, sorry Seb, think I may have misunderstood.
When I followed your link to the spirit monitor page, it then had a link to the a2-freun.de site, but this is the general a2 page... I just assumed there was a thread somewhere on that site.
Not to worry though, I Google translated some of the bits on the spirit monitor page and found it was very similar to the comments I made on the insight!
The insight was a super cool beast, I actually had two, one broke down with a water leak, and I lost my storage for the other one and had to sell it quickly.
The one with the water leak, I never quite managed to get the time to fix it and sold it on as a project.
I deeply regret selling both of them now!! You're correct though, spares could be difficult. There's a guy here in the UK who's a wizard on the batteries and electronics though!!