I liked Battle Boy...to this day, when I see him that is what I think of. Glad to see someone else remembers that show! Every time I mention it to someone I just get blank stares!
Found this on Wiki about its demise:
The series ended in 1982 following ABC's decision to expand Nightline to five nights a week, which moved Fridays to air at midnight instead of 11:30. By the end of its first season, Fridays was outperforming Saturday Night Live in the ratings, the later time slot hurt the show during its second season (And the fact that Saturday Night Live had rebounded.). One final attempt was made by ABC to save the show by putting it on in prime time. The episode (broadcast on April 23, 1982) was scheduled against Dallas, which brought dismal ratings, and it was the last of the series.