Hi -- and thanks to anyone who responded.

OK -- here's the deal. Replacing the battery took about 5 minutes. I took the bottom cover off the T2 and there the battery was, a $4 lithium battery fully accessible in a holder. So, definitely easy to change. Then I had to 'reload' the factory sounds. This was a little more complicated, but I found the original sounds on the KORG site in midi and SYS formats. I downloaded them, attached a MIDI cable to my computer, ran a librarian and BINGO!

Not too bad!

Joe.