hello, Im currently on deployment and my bike (2019 R6) is at a buddies house. His wife will start it once a week and for the last 4 months it has started just fine. last time she tried to start it, it wouldn't turn on. when she turns the key the cluster cycles and lights up but when she pushes the starter switch it cranks but won't turn over. after about 5 seconds it makes a really loud whiny/grindy sound. what is wrong? does the battery just not have enough power to turn it over? thank you for any help given.