My 2018 will be going on it's 3rd battery soon. My current one is a Motorcraft BXT-96R-590. I replaced the original battery with this one only 2.5 years ago. I drive 7K - 10K a year and keep the battery on a trickel charger when I know I will not be driving the car for a few days. :sadface:
I purchased the Ford Protect extended warranty when I purchased my 2018 a few years ago. Extends it out to 10 years/100K from when it was built. I haven't had to use it yet. More for peace of mind.