Bike was left on and battery fully discharged. It
Were you having trouble with the battery before this incident? If not, then charge the battery with a charger...NOT a trickle charger...for 12 hours. After this, check the voltage with a volt-ohm meter, it should read 12v -14v. Install in the bike, connect and check it again with the volt-ohm meter, it should hold the same reading as off the bike.
Try to start the bike, if it starts, check the battery again, now it should read 14v or a little more. Turn everything off and try to start it again. If it starts, the battery is still good but don't leave it on like that anymore.
If you get anything less than 12v after ther charge, the battery most likely has a dead cell and needs to be replaced.
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