When I'm not driving my Model S, I leave the charger plugged in the car. The Tesla will periodically turn on the charger as the 'phantom drain' continues from the draw of the onboard electronics. Once you've lost about 6-7 miles of range from this phantom drain, the car automatically charges back up to full. Now with the Clarity, I haven't noticed that this automatic recharging behavior nor have I seen the stated range drop on the phone app, even if the car remains parked for a period. Now that might not mean the range isn't actually dropping, as all batteries will lose charge over time, especially in a relatively cold garage, but I haven't seen it. So without confirmation that the Clarity's charger periodically kicks in on a parked car, is there any reason to keep the charger plugged in the car after the charging has stopped? I observed the same behavior on our PHEV Sonata. We never saw the charger kick in again after charging initially stopped.