Yes you will need to add weight to get to the new 1200 gram minimum if you are using the Orion 2400 lipo. Not sure if the batteries have to remain in tech but probably not as how would you charge them?

The Tamiya TCS organizers are really trying to get the Mini class back to a driver’s class so they are going to have RPM limits on the hand out motors (the RPM maximum being discussed is 14,000). They will test your motor when you take it out of your car and turn it in. If it goes above 14K at 5 volts, then penalties could be handed out. It has not been announced how they will dish out the punishment. The challenge is going to be how to keep your motor from going over that 14K. After you run one of these silver cans, the brushes break in, the bushings break in and the heat will drain the magnets, all causing a motor to increase in RPM.

It's going to be a hoot!!! I can't wait.