I think I have a bad battery. Just after 2.5 years from truck build date. '18 3.5EB.

No Start/Stop over the last few days even with AC completely off. Temps from high 60's to upper 80's. Drove the truck for an hour straight and pulled over and checked it. 12.2v with all accessories off. That should be about 40% Charge for an AGM.

 

Ok, do you have a question? It does sound bad as you should have had a surface charge indicating 13+ volts right after driving. Possibly a bad cell...

 

Park the truck with the hood open so you won't "disturb" it or wake it up, let it sit overnight and then check the battery.

 

Battery or alternator. The wife's Explorer's alternator took a dump at 40,000 miles. Hope it's the battery.