I have one of these http://www.bikes4you.ie/scooters/twister-electric-scooter-1000w-48v-6inch (do not remember 800W or 1000W, but I know what 36V). So I left it in garage (all time was ~ +15C) in winter time, but now, in spring, it won't go normal. I charged a couple times, but it's go slow...