Hi LeVel. The battery is only covered under the 3 year/36,000 mile New Vehicle Warranty.Is the battery covered under the powertrain warranty? I'm at 42k miles so the bumper-to-bumper is gone.
If you look on the Ford owners website, or your individual Dealer's website, you can usually find discount coupons for the Motorcraft batteries. Look here: https://www.ford.com/support/servic...519!3!292004267430!b!!g!!+motorcraft +battery
I would recommend you get the upgraded "Tested Tough Max battery". 3 year full replacement warranty, 100 month pro-rated.
Let us know how you make out and good luck.