It would require a high level knowledge of CAN in order to speak/reply to the VCU (like an ECU in a gas vehicle). The protocol for the Eltek Valere powercharger 3000 is fairly documented, but would the batteries stand being charged at 2x the speed? Is there a shunt inside the Brammo that would cause a fault if you did try to charge them at a higher current? How do you reverse engineer it?
It's a lot more than just connecting the charger to the B+ and B- and letting her rip. There's a lot of "communication" going on between all of the modules. You have the VCU, Display, Charger, Motor controller, Battery Management System Main unit (which connects to each of the 7 battery packs board) as well as an IO module that controls lights, signals, etc.