On Dec 14, 3:29*pm, "Percival P. Cassidy" wrote:
I have several 18v Ryobi tools and battery packs, including one of the
lower-capacity Li-Ion ones that shows as fully charged in the charger
but will not operate a tool and shows no voltage across the "supply
terminals" (there are separate charging contacts). It seems likely that
there is an internal broken connection between the battery and the
"supply terminals" that should be easy to fix if I can get the case apart..

But that is the problem: I have removed 4 Security-Torx screws in the
bottom and one in the "plug" part that goes up into the handle of the
tool, but the case still will not come apart. I can pry the halves apart
a small amount at either end, but they seem to be held firmly together
in the middle. There do not seem to be any screws hidden by the label on
the bottom

Has anyone managed to take one of these things apart? If so, how?

Perce

I think your problem lies here.
http://en.wikipedia.org/wiki/Lithium...y_requirements