Battle Beasts were the Hasbro version of the Takara "Beast Formers" toy line. Kind of a He-Man meets Kinnikuman (M.U.S.C.L.E.) kind of thing. In Japan they were part of the Headmaster TV series.
kool-aid killer, once you start collecting them, you're probably gonna be in it for the whole set. I think there's something like 76 in all. I have no idea how many there are from the Takara line -- probably more. Good luck.