I discovered the regenerative braking doesn't work either because: 1. You have topped off the battery full and there is no place for those extra electrons to go. 2. Your battery is too cold to be charged and needs to heat up first. I have been playing around with a solution to 2. 1. Charge to 85% overnight 2. Cold Morning: Set to 90% and Charge Over Breakfast (2b. Turn on climate while in app to heat up car while on shore power - just for warm car - does nothing for braking) 3. Get Into Car To Warmed Up Battery? And Regen Braking Working? So the question is: Does charging a bit in morning (but not to full) help the regenerative braking become active right away on a very cold morning because it warms up the battery for charging? I just started testing this theory, but wondered what other more experienced winter Tesla owners thought?