Thanks for the responses.
- The Li-ion battery was sufficiently charged (about 90km range, if I recall) when initially parked overnight on the cold night, so that I didn't think I needed to plug it in to charge for the next day. And after we finally got it going, it had close to a full charge.
- Yes we normally leave it plugged in (charging on the Level 2 charger) until the next morning, even if it has reached full charge and the 3 blue lights on the dash stop flashing.
- As I stated, the 12v battery was weak, and it may be that it froze and so that may be the source of the problem. But I have never seen the third blue light flashing, as the manual indicates it should, when the 12v battery is being charged by the Li-ion battery.
We have now replaced the 12v battery, and are using the 120v Level 1 charger overnight. This means the Li-ion battery is not even fully charged by morning, but also that the Li-ion battery temp gauge still shows 2 bars in the morning (presumably due to the heating caused by the charging.)
I have ordered a bluetooth OBDII reader and downloaded the Leafspy app, so that I can monitor battery temps at home. Some evening when the temp is just around -20C, I'll use the Level 2 charger again and see if the battery maintains its temp once the Li-ion battery is charged. (Right now we are in a week-long cold snap due to a polar vortex over the Prairies, with nighttime temps of -35C.)
Re: whether US models have an installed battery warmer, I've attached two images, taken from the factory service manual for the 2016 Leaf,. The first shows a table which seems to clearly indicate that US models don't
have a battery warmer. The second is simply a chart on how to decode the VIN as to whether it is a US, Canadian or Mexico model (key digit is digit 12). (As I mentioned in my first post, our Leaf was imported to Canada from the US and has the corresponding U - and not N - in position 12).
Any further thoughts, questions or additional information regarding this issue of battery warmers in US models would be appreciated.