Hi, you can see the battery (a standard CR2032 lithium flat, disc-shaped battery) in my re-potting thread.
http://infekted.org/virus/showthread.php?t=31443
For example, you can clearly see it here, in the centre, along the bottom.
Looks like it's just a simple clip holding it in place, no soldering needed.
BTW, I have an old Virus Indigo v1, and I haven't needed to change the battery yet. The same with a 15 year old Korg Trinity which has the same type of battery.
I think the standard Virus hardware warranty only lasts 1 or 2 years, so breaking that seal wont affect you if it's older.
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PS > And another thing! Will the Ti|3 have user customisable/importable wavetables?
A ribbon-controller or XY-Pad might be nice, too, please! Thanks!