Mine is a Sears also.Has 2 40 and 200 amp.Its probally 20 years old.Neber a problem.I also have a battery tender.For a real slow charge and to keep a battery charged during Ohios winters they cant be beat.I also have an old antique small charger thats at least 40 year old.Dont know what brand but its only like a 10 amp charger.Rocky