Solve the winter problem with a pair of these, 12v or 48v only though:
http://www.aliexpress.com/store/product/Heated-Grips-Handlebars-Hand-Warmers-Throttle-for-Motorcycle-and-Snow-Winter-Cold-ATV-Snowmobile/632724_1253210719.html
http://www.aliexpress.com/store/product/Heated-Grips-Handlebars-Hand-Warmers-Throttle-for-Motorcycle-and-Snow-Winter-Cold-ATV-Snowmobile/632724_1253210719.html