As the mercury drops and end of riding season approaches now is a good time to think about your motorcycle's battery. Low temps can really be a drain on a battery, especially one that hasn't had a good charge in a long time.
At the very least consider disconnecting your battery cables. Almost any vehicle has a slight draw of current (clock, ECU, security system) that over time can cause the battery to go flat. Disconnecting the leads will at least stop the drain.