These things DO NOT like cold weather when trying to start. Ridden every day in the summer they will start every time with a stock battery, but in the cold and started once a week.... even a battery tender won't cut the mustard. The Odyssey and Odyssey charger is the only real remedy I've seen for this. Now that I've stopped trying shortcuts and just did what the guys have been doing here on the site for years (PC625 and matching charger), it can sit for a month in below freezing temps and start first time, every time. There just isn't any way around it, I tried.