I have a segelei 30w. Even when the device is off (with battery installed) it is putting out about 3.7V. My thought was it is defective until I checked my vamo v5 to see if it was doing the same thing. It is. It puts out 4V even when the button is not pressed. I'm not having any weird issues with the vamo, but the segelei does get warm and drains the battery when off. Any ideas?