Paul,batteries ARE allowed as are airboxes (subject to a vote!)
All batteries must have a minimum weight of 25 kilos in 583 ,and in 620,s they must be carried and securely strapped down on the trailer.
The only exeptions to these rules are where the rider is over 50 years of age,they can run with no battery and are also eligable for treble points at any rounds run on a weekend!
Butch