If you spend money on the bigger better units, some will load/draw/charge batteries off and on, but I should have mentioned you wont need to leave it on the tender ALL winter. I will hook them up once in a while throughout but I have the cheaper models. Cold doesn't phase a battery like heat does. We leave our agm and lead acid batteries in an unheated storage trailer at work all winter long, but in the summer months we will bring them inside where its cooler. Up to you on fuel stabilizer, its not for everyone I guess. Another thing I failed to mention is its a good idea to do and oil change just before ( or at least late in the season ) before storage. Helps keep acidic levels lower for the internals. I've always done it, and then once warmer weather breaks you just check the tire pressure, fire it up, and ride!