Same as Valk, I too used the Deltran Tenders ... I have 5 of them and have used a couple of them since 1996 so they do last ... I use them on my Harley's. lawn tractor, an will use one on my Crossfire

The Deltran brand will not over charge the battery ... it will bring the battery to full charge and then go into a maintaince cycle ... you don't have to worry about damaging the battery ... hook it up and forget it till your ready to drive