A tender? How often is it plugged in?The Scorpion has survived the abuse I have given it as well as the secondary smaller Tender for a while now.
As long as the LiFePO4 doesn't fall below 90% capacity, it will be fine even in cold temps (since the alternator charges at around 14.4V).
If it were 17F outside, and you had just come back from not driving it for several weeks with it still plugged in, it would definitely take some damage from a jump start or full power alternator charge.
Several people here have gone through the batteries already, which is in line with what the specs suggest. An LTO replacement would last longer for similar money while weighing a few ounces more.