There was a tough paper substance covering the terminals of the Roomba battery that I was finally able to remove. Peeling back the paper insulator revealed the tabs that are soldered to the cells.
I've got alligator clips going from a cell on the Roomba battery to my Lacrosse charger, and I'll see if I can determine the capacity of each cell in the pack, and hopefully revive it. If need be, I have a couple of new cells I can replace the bad ones with.
This is what the battery looks like with part of the paper insulator removed
This is what my battery charger looks like dissembled. The charging pins are now exposed so that alligator clips can connect to them.
