I went to install my automatic disconnect circuit into the Prius today. I quickly found that it was going to be a big pain to do with the kit in the car and at least some batteries would need to come out. I'm glad I came to this realization, because I found a few things I wouldn't otherwise.
This is the first thing I saw. It appears as thought the hold down was starting to wear away the casing on this battery. Over time, I don't know if it would have gone through, but its something to look out for.
The next thing I found was much worse. It appears one of my batteries failed on me. I'm not sure how. The bolt was quite snug yet. But, you can see that the heat from the first battery effected the second one too. So, I'll need to get those both replaced.
So, I finished up removing the kit. It is sitting inside again, waiting on parts...