Hi Wynn,
In your power system you will need about 11 to 13 watts of power per oz. for CLPA.
Deans #s are very accurate, I use them. They reflect some very successful ECL CLPA setups.
If you haven't already done so, you may want to look at some of the setups on the top of this section. They will give you a very good idea of what size battery you need. Almost every size CLPA plane is covered there. :-)