I just bought a new battery, it is a AGM battery and a little smaller than stock in size but more CCA. it is 12V-6ah-180cca. bought from PowerSportBatteries.com batery#WPZ7S price 43.90 shipping 7.95 totle 51.85 ordered on 12-2-2013 received 12-6-2013 . temp. is 24* outside and tw started faster then with stock battery. will let you know in time how it is working out.