Tesla motors does not deny the fact their batteries can be bricked. They say they have done much to prevent it from happening yet you can destroy the battery pack in much the same way you can destroy a motor if you attempt to run it with no oil. Because the battery pack is composed of many cells both in parallel and in series it is impossible to just unplug it. The pack will always be using power because the cells are in parallel. And because they are in parallel they will always die out if left alone. It is not a problem though in most cases. You must use the car in the way it was designed to be used. Likewise with a normal automobile you must take into account oil, timing belts, water pumps, etc.. Bricking is possible. Know the problems and know how to work around them.