I do not have a T2, but I do have an X0, which is very similar. It runs fine with two R123, in regulation and no overcurrent, which happens with the 24/7 and the T1; in other words, the T1 and the 24/7 do not work with Li-Ion 123s, while the X0 (and the T2, very likely) will work fine with two R123.
None of the 2-cells Inova lights can be fitted with Pila 168S. I am afraid of removing one layer of shrink-wrap since it helps protecting the tiny connecting wire placed alongside the battery.
Anthony