I used the simple ctec/Porsche-labeled no buttons model on an Odyssey in my '01S for at least 5 years and it did a perfect job in that it kept enough of a charge on a battery to start the car in cold weather but that battery was in a car where the battery was always fully charged when stopped.
Since I had a separate charger from the same era, I used the charger on any run down batteries and saved the maintainer for hibernation duties.
Optimal, maybe not. But it worked for me.
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