On the way to work this morning, I had the car go into turtle mode rather suddenly while accelerating up a moderate incline. Ambient temperature was about -7°F. At the time that this occurred, the percentage of charge was about 40% and was nowhere near a LBW or VLBW. It did recover partially after bouncing around in the teens and then back up to about 28% in the span of a few minutes. I typically use about 25-40% of the battery to get to work, depending on the time of year, and it was on par with the 40% worth of winter battery consumption when I did finally arrive at work. I also did reduce speed and turn off the heat after this happened, as I was not sure what was going on and really did not want to be stranded in the cold weather.
I don't have LeafSpy, so I am limited on the information I can provide, but I started with about 57% at the beginning of the drive, and have a 20 mile drive to work with about 80% of it on freeway. Battery was at 15% when I arrived. The battery temp meter was at 2 bars, and did rise to 3 right around the time this happened. Power was limited on the car early in the drive, as the top 2 and bottom 3 circles on the power meter were not illuminated. Car was not left plugged in overnight.
I have had the range adjust on me when the battery has warmed up for me in cold weather drives, but this is the first time I have seen it drop like this. I have leased my 2016 Leaf for exactly a year and has about 15,400 miles with no noticeable battery loss yet (12/12 bars), and had a 2013 prior to this. Did the car try to protect the battery when I was trying to accelerate up the hill or is there something more serious going on? If just a battery protection measure, why would the battery percentage drop so suddenly? Anyone else have this happen as well?