I have had two Optima batteries. Neither of them had ANY warning about special chargers being needed. Further, neither place of purchase has ever heard of this. I have used both a regular charger and a "trickle" charger on an Optima with no adverse effects. Dick Ryan --- ttanaka504@xxxx wrote: > Dear. List: > > Hello, list. > I am not driving my D for a long time and > beginning to worry about the > battery in my D...so now I am looking for my new > battery, red hat Optima, > charger. <excessive quoted material trimmed -- moderator> > sometimes...so I look at other one, On Board Power > Tender, in Battery Tender. > > Here come my questions, which one I should get.