One battery making an r/c car faster over another battery isn't really an issue. Nimh have this problem now, IB4200's are faster than the old gp3300, and everybody has IB4200's in their pits, so nothing will change with the 7.4 lipo batteries. The fast drivers will still be fast, the slow drivers will still be slow. One big problem I see is that its very easy to permenantly damage a more expensive lipo pack by running it under 3 volts per cell. Lipo cutoff speed controls are not enough of a standard yet.
I think keeping the minimum weight the same, and setting a future date far enough ahead for lipo legalization so everybody has plenty of opportunity to learn, buy, and adapt to lipo is the way to go. Say if the date was July 1st, 2008 for 7.4 volt 6000mah capacity lipo to be legal, I think the switch would go over smooth. Thats a year to buy a charger, batteries, and lipo freindly speedo's. I think a timeframe to a standard is what is needed.
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