Pretty new bike, 2016, 10 days past warranty/....☺
Battery is draining sporadically. Sitting nice at 12.5 volts, and then I go into a store for 20 minutes, and it won't start. Checked voltage, it's dropped to 11.5v.
Bike is all stock - no changes (yet..).
Left battery out all night, charging, and it's back to normal 12.5v for a few days. Then today, same problem - needed a boost at a repair shop.
Weird that I heard a whining sound for 5 seconds, occasionally, coming from near the ignition switch or engine. Even with the key out.