My main sources of information about these batteries came from here (thanks everyone) and also from the ibiblio sites (primarily) who have text files from the 90's when homepower magazine did a lot of testing of these batteries as well as nicads.

The often quoted efficiency of %70 I am not too sure about. I have a Trimetric 2020 and intend to find out for sure their efficiency. What I am sure about is that they lose the uppermost of their charge very quickly (overnight). So, your 100% charge will no longer be so in the morning. The big plus is, of course, they can be completely discharged; as well as being stored in a discharged state. Also, they are fairly benign on the environment--so that's a plus.

I haven't got my battery going yet, I need a few things from ghurd to build a modified controller as well as my panels..