I own at least 6 battery tenders for my cars, boat, and my Dixie Chopper.
I have been using the Die Hard Model 71219 6/12 volt, 2 amp charger exclusively for many years. They are always in use during extended storage periods.
I have never had one of these chargers fail, nor ever had a battery problem due to over or under charging. All of my batteries seem to last through their warranty periods and beyond.
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