RE: battery upgrade
IB cells have very good power but I seen one blow up at my track. A couple people were talking to me and they say that these IB cells have great power, but out of nowhere they will explode. I dont think EP is Elite cells, I have a EP4200 and it looks different than the Elite cells.
The Energ 4600 is about the best battery you can get. Racers have tested and they really olike the energ battery. The best nimh battery is the Orion 5300 SHO cells. $85 for 6 loose cells, plus $20 for all the battery bars, wire, etc.