Radar is the largest driver of battery use, far greater than the flash of the light. We officially state runtime as 7 hours in all modes from the 2,000mAh battery, but again it is radar dependent. 7 hours would be worse case, with Radar constantly working and being the main driver of the battery. When no cars are being picked up by the radar, the radar goes into a battery save mode and provides significantly less battery draw. This significantly extends battery life and is the case for most normal riding conditions. We are generally seeing up to 12 hours of run time in average riding conditions on day flash mode.