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I Just replaced mine a couple months ago and was looking very seriously at Deka until the local dealer told me about their warranty. I think he said it was 36 months pro-rated if it was going in a gas vehicle and 24 if I put it in a diesel vehicle. I was really disappointed with that, so I went back to Ford for $20-30 more a piece and got the same Motorcaft batteries that I had before. Ford's warranty was, by far the best one of any that I looked at (NAPA, Deka, Duralast, Walmart, and Motorcraft). They've been in there maybe 4 months so far and I have no complaints. I don't know if I buy it or not, but the guy at the dealership (Parts counter manager) said he would bet money that the batteries that I turned in were OEM originals. Again, I don't know if I buy that or not, but he said that was the case because they didn't have any labels, date stamps, marketing or anything in them. Who knows but they carry a pretty good prorated warranty on them.
Don't get Optimas....... I'm putting XS Power batteries in this one probably next year. My Optimas are 4 years old and not near as strong as they once were. Never had anything but problems with Interstates when I ran them 6 years ago too. Much worse than the Optimas have been. I'm running an XS Power in my F-150 and it's been great. We'll see how long they last, but they are supposed to last a long time.
Edit: Motorcraft batteries are good batteries too. Especially for the money.
I just went with the Ford Mototcrafts. I have one in my Jeep that's lasted 7 years and that's using a winch on it. I have also had them in my 97 Powerstroke for 3 years with no issues. EDIT: Forgot to mention you need to get the heavy duty ones with 850cc amps.
I've got the duralast gold 850cca they are 3 years old and no issues
me too. Went with the biggest ones I could get. theyre probably 850s mine are about a year n a half. did batteries and starter around the same time. I remember being very impressed with how fast the combo starts the truck.