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I've used a variety of Deltran Battery Tenders over the years.
Just leave them plugged in and you'll be happy
My Car buddy and I have 8 of these Deltran +'s between us in our storage/shop and have been using various models for almost 20 yrs. - Deltran Plus for as long as I can recall.... The cars sit more than I care to admit but never an issue with them firing off and being ready to go.
Also have not had an issue with the battery "getting weak" if I bring a car home for several days and let it sit without the Tender.
I have been using this on for at least 3 years 24/7 no problems yet. I don't think they make this model any more but they have a newer one.
Hello, I have a desulfator "batteryminder" 12117 the same as yours. It was damaged by the battery acid. Some tracks on the circuit board are missing. I need a photo of your circuit board so I can rebuild mine with straps. Can you help me with this?