Unless it's below about 9V, I believe. You then need a charger instead of a conditioner to bring it up to the required voltage. At least that is true of the CTEK I have.
I didn't know that, mine has got a number of different modes, including a recovery setting. I had a look and it claims to be an XS7000, but it doesn't match the current offering under that name, so I'm a bit confused - but then I did buy it nearly 7 years ago, so I guess it's quite possible CTEK have changed the range...
