Now we have 3 threads?
http://www.bikeforums.net/cyclocross...al-doping.html
http://www.bikeforums.net/road-cycli...ing-motor.html
So far I haven't seen anything indicating they actually found batteries in the bicycle. Of course, perhaps that detail was lost in translation. But, it is quite possible that the bike which apparently WAS RIDDEN in the race until it had mechanical problems had a non-functional motor system, with no intent to cheat.
As far as why install a motor?
It could be used as a training aid, allowing weaker cyclists to train with the stronger cyclists, or even making training with weaker cyclists to still be competitive for those stronger cyclists.
At this point, I think one needs to just let the UCI unravel exactly what happened before condemning anybody.
And, if there was no intent to cheat, the mechanics and riders should have know what bike was being used in the race.