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Could also set a departure time for 6am so it proactively warms the battery towards the end of your off-peak period.

THIS... has been my experience. Ford's mobile charger would not work for more than a couple minutes in the cold. Tried my Rivian mobile connector and it worked fine, but was painfully slow (of course).

All I really meant was that when it's raining you get reduced efficiency (all other things being equal). But I can appreciate the scientific exhibition!

YES - precipitation was not one that I expected, but I guess wetter air is denser than dry air so it can make a noticeable difference.

I was about to write a response to the OP, and then I read this one which said everything I wanted to say.

I've heard tales of RV parks having trouble with EVs charging on their 50-amp outlets (and sometimes not allowing it) because the circuit is shared with other campsites and can trip the breaker if there's a sustained 30-amp load from an EVSE and the camper next to you fires up their A/C.

I have found that if you run climate (especially heat) while in accessory mode, and then go directly to startup and drive, then "This Trip" seems to include your accessory time in the efficiency calculation and it will initially show abnormally low efficiency because it's including that energy...

It's the inconsistency that bothers me most. Either round it everywhere or truncate it everywhere. Pick one. I am only a little bit OCD, but it bothers me a great deal when "This Trip" on the dash reads 2.1 mi/kWh and the center display reads 2.2. And now that I know they're inconsistent with...

I'm not seeing it anymore. That 52% is my HVB. (Yes, I'm sure.)

May have just answered my own question... https://www.ohmmu.com/product-page/12v-lithium-battery-for-ford-f-150-lightning And I guess since they say it's for the Lightning it must fit in the same space as the OEM battery.

Do you have the link to the item for purchase? Did you have to do any modifications in order to install?

I have tried - and when I do I get a notice that says "cancelling other navigation".

As far as I know you cannot have a destination programmed into two nav systems simultaneously.

With regards to the Nav telling you to charge, I believe there may be safety cushion factor at work there. Ford would be in for some extremely negative publicity if their nav told someone they would make it without charging and they ended up stranded - so I'm sure there is a tall threshold.

Rivian does this as well. Clearly it can be done.

How long does it take to reach that speed with no precondition?

Yes, that's exactly what I'm saying, but I worded it poorly. Seems there is not a whole lot of benefit to the precondition since the battery warms aggressively once you start charging anyway. Shaves a few minutes off your charge time maybe, but for a 3-hour trip a few extra minutes doesn't move...

Not like Wiscosin severe, but we do take some long trips for skiing where the temps are usually around the 20s (occasionally high teens).

Here's a question that questions the question itself. Bear with my while I lay this out. I don't hate the FordNav, but there are several other apps I prefer in general. The only reason I may use FordNav are (1) to get a better range estimate, or (2) for preconditioning the battery before DCFC...

Thanks Rick - is 77 the optimal temp for charging or for driving? And do you know if there would be active cooling in the same way like if you were driving to a DC charger on a hot day?