Yes, you can run 6 Cell (there is no 7 Cell) with no problem! (6-cell = 7.2volts) (5-cell = 6volts) Actually, 6-Cell is what most run anyway. During our September month of "de-bugging" of the carpet & electronics, we are grouping similar cars into one class. We want to start up a points series starting in October so there we will place cars in the particular "group", such as stock and modified. Mini-T's are really taking off and our store offers the largest supply in the area. If I were buying a Mini-T, I would get the 7-Cell battery with the Peak Charger (by TeamLosi). Stop in this weekend as we should have a good Mini-T class again, and probably larger than last week (because of the bad weather) We may even have a "night" race (turning down the lights) as we have several drivers with lights.
Thanks for chiming in! We need more interactivity among RC people such as yourself!