I've heard of it being done, but not sure if it would work. I have a 2009 XTX and I added a second battery controlled by a continuous duty solenoid. The solenoid allows me to charge the second battery and disconnect it by a switch on the dash. I also installed remote battery terminals for jumping the battery if needed. With the XTX you still need 12 volts at the coil to fire the engine, but the stator should provide that.