Still trying to get my kit together just back from hol's and skint,so need 12v battery,2x ni-cad battery and a charger and i will be ready to roll get the pun lol....

Am going to the woodvale rally saturday so might see some of you lot down there.Please can some one tell me whats the score with the transponders for the lap recording were can i get hold of one,is it a must have thing because not really read much about them?