Mugen.
Are your bikes able to be ridden as hard as they can be for the lap , or do the riders effectivelly have to ride at half potentiometer some of the time to ensure getting the whole lap in ?
If the bike does have to be riden within its battery life it would be an interesting experiment to try the bike at a circuit where the bike could be ridden to its full potential for a complete lap and then compare lap times , somewhere like Snetterton 300 .