I have a 2016 with a 200 amp alternator.
I have no problems with the operation whatsoever, let's make that clear.
I checked the voltage when I first bought it in the winter time (Florida LOL) and when the temperature was 45 degrees, it would hold 14-14.2V.
Now when the temperature hit 92 degrees, the voltage is holding between 13.4-13.7V....and 13.3V at idle. When all the accessories are running the voltage doesn't drop, or drops .1 volt.
Ford dealer told me this is within specification....does this seem low? Battery voltage with engine off holds 12.6V.
Every truck I ever owned held no less than 13.8V in 90+ degree weather.

 

It DOES seem just slightly low, but my old 2005 King Ranch did just about the same thing. I think the lowest it would go though was around 13.6V when the weather and engine was hot on a trip.

If your battery is holding at 12.6V in a resting state, it's being charged. A brand new, fully charged battery should register around 12.7V.

I haven't really studied this, but I'm pretty sure if the battery is hot, the charging voltage is limited to prevent boiling the electrolyte.

- Jack

 

I would replace the battery for an Optima in a NY minute but they don't list one for my engine.

 

Odysseys are the best batteries these days, and they don't list one for the 2016 F150 either. The Die Hard Platinum is an Odyssey, but no longer made. In fact, Sears is trying to sell off the Kenmore, Craftsman, and Die Hard brands.

 

Any leak proof battery is on my list of things to buy.