Check your battery connections. A loose or corroded cable can cause this, even when the battery appears to have good voltage.
Second, I agree with the others, try jumping it with another vehicle. You won't need to be concerned jumping from a car or truck. The bike can only draw as much as it needs, it's not possible for excess to come from the other vehicle. Just be wary of cranking too long at one time which can over heat the starter motor. 10 second, rest 10 seconds. Key off when resting, as that will shut the headlights off and make it less of a drain when you make the next attempt.