Hey Dave, is it the original battery? if so its really on borrowed time, a 2011 bike built in 2010 and its well into 2015??? ether way take a small volt meter with you next time out, and have somewere on the bike you can get to battery volts to ck it, battery, terminal, anything that registers batt volts, and after you have run it hot and shutdown wait however long you say when it starts hard hook up the volt meter and try to crank it while reading the volt meter, now I'm not exactly sure where its supposed to be but it would seem like it would need at least 10.5-11.5 volts to lite up, if it go's much below that you may need a battery, bike batterys don't seem to stay like cars, 2-3 years is the norm, if your religious with the batt tender maybe 5-6, and that's pushing it, the only other thing is the starter itself, I have seen them when hot they say fuck it, it turns over but sounds like the motor has cold 90 weight oil in it, you will need to hook up a amp meter to ck the starter draw, mine is 10 years old and on its third battery, but I do have a small scooter battery in the tail to give it a little extra boost, its not 24 volt just a double battery that small battery has been there 3-4 years and almost start the bike on its own, and if it sit more than a day or two the tender is on it, ..........and good hearing from ya..............