I didn’t even read all these posts because this has been discussed so often. There is not reason other than laziness to leave a battery tender on for extended amounts of time. Get of your lazy butt once in awhile and put it on and take it off the next day every 2-3 months. This also gives you a good chance to burn a few calories and check things over. If reading a few nightmare stories about fires from these things doesn’t bother you, it should.