It seems fairly accepted on the forums that charging to 100% and letting the car sit for more than an hour should be avoided as it can cause faster degradation over the long term to the battery. The number of times I've seen this basically universal advice on TMC over the past few weeks lead me to wonder if there is any evidence of how bad this actually is for the battery? Are there people that have regularly charged to 100% and let the car sit for 8 or 12 hours repeatedly over several months (or years) and experienced increased degradation as a result? One of the reasons I ask is because my Nissan Leaf (which is being upgraded to a P100D as soon as my car is delivered in December) has no ability to charge to anything other than 100% unless you unplug it manually. As a result, I charge it to 100% every single day, and it sits there at 100% for at least 8 hours most nights and sometimes for several days. I've had the Leaf for about 1.5 years now and haven't seen any sort of reduction in range or anything like that. Is the Tesla battery technology more susceptible to this type of degradation? Is this really only a concern for those that plan to own their car for 5+ years? I'm not asking because I want to regularly charge my car to 100%. I will follow the recommended charging guidelines Tesla suggests when my Model S comes, but I was very curious as to how people arrived at the 1 hour figure and whether there was any evidence showing how damaging sitting at 100% is for the car.