So the local charging station is at a Driving school and I went to unplug and the one of the instructor says.." You are going to ruin the battery and and cause a spike in charge because you did not power off the Charger prior to disconnecting the gun". I didn't think this was the case? This public ClipperCreek charger doesn't have a power on/off switch and is always on. I pulled up the Volt manual and I don't see any official process to plug/unplug. Has anyone heard of this?