Discussion about the Korg PolySix synthesizer

I bought a Polysix the other day, and am extremely happy with it, and naturally would like 
it to work consistantly for a long time.
I've read up on the life-span of the factory-installed batteries and their tendancy to leak, 
and want to avoid the problem. So basically, I want to know if I've got an original battery 
and if so, how soon I should replace it.

Opening it up, I see that the battery has some japanese characters on it, followed by 
"lithium batter" and then "CR2032." I'm kinda figuring it's probably an original battery? But 
I honestly don't know... the circuit board underneath looks a bit worn, but I'm not sure if 
that's from an older battery or the one that I'm looking at now. Removing the battery, I 
can't see anything out of the ordinary about it. It's clean and in fine shape.

So... think I'm good to go or should I be thinking about replacing my battery?