Just learning about the Blue Tooth ODBII readers and was wondering how one identifies the newer versions from the older ones that I understand can cause excessive power draw when not actively in use. A lot of dongles out there for less than $10 so I guess the question is which ones are the "Good" ones or how does one tell the good from the bad for use with Android devices and the Leaf? Just spent about an hour stepping backwards through this thread and really did not hit upon anything one would consider a list of compatible dongles verified to work. I have a 2014 Leaf S that I would like to set up with something more in tune with it than my old Scan Gauge device which I have been using in my Ford F53 10 ton truck.