Specialized artificial crystal designed to produce and conduct power in a number of electronic devices, such as datacorders. Also used for StarCon Shuttles and StarCon ships, in much greater quantities. It is the Official Power Source of StarCon.
In Roger's quarters, when you look at the universal translator, the narrator says "Too bad they don't make those little Dilithium watch batteries anymore.", indicating that Dilithium may have been used earlier, but later replaced by Divalium (probably either because it was better or they just ran out of / couldn't afford Dilithium).