Gentlemen,The factory battery is an Optima Red Top battery that is FGT re-badged. Johnson Controls bought Optima and moved the plant to Mexico. Yup, junk at best now, ask me how I know. Sears Die Had that was a perfect replacement (Model P-3 Platinum P-3 - Group Size 75/86DT) discontinued now if I'm not mistaken.
This will drive people crazy, but the most reliable choice is a standard Group 78DT (dual terminal). Available at any major auto supply or discount store. I just replaced my last one after nine years and it was still in good shape. i just felt guilty. Fits right in with no modifications.
Duracell AGM Automotive Battery - Group Size 34/78 at Sams Club $130Make sure the replacement is an Absorbed Glass Mat (AGM) type and that your charger supports AGM.
That's what I did. I know a lot of people complain about the new OEM battery but mine is two years old and no problems. If it tanks, I'll just buy another one.Well I made my choice, car is finally starting to be a bit "loagy" on start up, and as it will be off the tender for the trip to Utah and back, I figured it was time to replace the original battery.
I got the Ford supplied Optima. I looked at Auto Zone, and their Optima was something like $259, The Ford supplied was $209 (I paid a decent amount less). And the cool part, as Frank mentioned above, it does indeed still come with the GT sticker.
I've been thinking about this one too. My only reluctance is Duracell dry cell batteries are crap. When they run down they leak and ruin what ever they are in. I know these are different but still Duracell.Duracell AGM Automotive Battery - Group Size 34/78 at Sams Club $130
Yup, this is exactly what I did. One thing to be careful of is that the battery is not too high and hits the metal brace above the battery. There is only about a 1 inch clearance above the terminals. What I did to avoid this is I bought a battery with the terminals reversed (Deko AGM) so they are no longer under the metal brace. Reversing the terminals also makes it much easier to install the battery without accidently grounding it on the brace. The cables are not affected for this change. The battery has been in use for 4 years now with no problems and it's not excessively expensive.This will drive people crazy, but the most reliable choice is a standard Group 78DT (dual terminal). Available at any major auto supply or discount store. I just replaced my last one after nine years and it was still in good shape. i just felt guilty. Fits right in with no modifications.