My car has an alarm/immobiliser and therefore has some drain. And it's not a daily driver. So - to make sure the battery's not flat when I do want to...
There's also a magnetic breakaway connector that you can purchase for the CTEK. So if you drive away and forgot to disconnect the tender cable, this...
That's what I love about them, no unnecessary electronics, screens to trawl through, to find the feature you want but then give up coz you can't find...