I personally had already bought my last Deltran "full size" battery tender. Every single one I've bought in the past had died within 1 year of purchase. They make nice paperweights. And trash can liner filler, too. Never again. The Juniors are great, though, even on the AGMs. And none of them ever had to work hard, as they were on good conditioned batteries already. I don't get it. The CTEK is awesome though. I've had that one going several years and it's durable and simplistic. Now it will die since I touted how great it is.