Leftie, do you mean the -4F limit mentioned in the manual? So just don’t let the battery temp drop below that? How many bars on the temp gauge correspond to below -4? (And do the blue bars all the way to the left count?)
Sage, the reason I mentioned ambient temp is for a few reasons, one of which is the Li plating issue. My understanding is that charging the battery at any voltage - L1, L2, or L3 - when the battery temp is below 32F can lead to this, yes? But then what do you do when it’s in the mid 20’s F for weeks at a time, your daily commute isn’t enough to really warm the battery (only 6 miles each way, with an 8 hour break in between where the car sits outside in a parking lot), and you tend to both park it and charge it outside all winter? In the summer, when your battery gets too hot, you can just wait for it to cool down before charging it. But in the winter, unless the plan is to just wait for spring, you can’t really do that. I usually tend to park my Leaf outside in the winter because my L2 EVSE (12 amps, 240 volts) is on the outside of the detached garage, though I could park it inside the garage if necessary and trickle charge on a 120 outlet. The garage has very little insulation so I’m not sure how much it would even help (this is the reason the EVSE is not inside the garage - because it gets extremely hot in there in the summer). Lately, I’ve been doing the same thing you do - charging it immediately after driving it, because the battery is warmer then. But the other reason I asked about ambient temp is for a sort of lazy, general rule of thumb, that way I don’t have to take a Leaf Spy reading every time I make a decision about where to park the car. (Like in warm weather, when ambient temp is above 60F, I try to avoid parking the car in the sun).
So I guess what I’m really asking is: should I just be parking the Leaf in the garage all winter? Or is there a conveniently measurable cutoff ambient temp below which I should park in the garage? By ‘conveniently measurable’ I mean just knowing/checking the ambient temp, or looking at the battery temp gauge in the Leaf real quick, as opposed to going inside and getting the OBD dongle and kindle (because I don’t store those in the car, in order to protect them from extreme temps as well), coming back outside, and then taking a LeafSpy reading, every single day.
I guess one way to minimize plating would be to do fewer charging sessions overall and just charge to a higher than normal SOC each time, but then you have to weigh the benefits of that against the problem of then letting the car sit at a higher SOC. In the spring, summer, and fall, I try to almost always keep the Leaf at or below 60% SOC. I guess I could charge to 80% during the winter if that would reduce the total number of charging sessions, but I’m not sure whether that would be better.
current: Black 2019 SV Plus with all-weather package (purchased 5/20)
former: Silver 2019 SV with all-weather package (purchased 5/19; traded in 5/20 with 15,000 miles)