Just thought some of you might be interested in this video and it might clear up some misconceptions
https://www.youtube.com/watch?v=ywn-vBjKblI&feature=youtu.be
Mike
In summary, below 25F:
1. Heat the battery for a few minutes with a heavy discharge.
2. Then charge at a low rate.
This sequence will warm the battery enough to prevent lithium plating / damage.
Great video.
Thanks Mike, lots of good info.
See what I did here 600 AH Lithium Battery Installation (https://www.foreforums.com/index.php?topic=37729.0)
The small battery heaters add about +30° on the low setting to the battery temperature reported on the Victron BMV702. About +40° on high. These cost less than $10 per battery. BattleBorn sells a heating pad for their batteries. When I got my batteries it was about $200 per battery. It will be interesting to see what their internal heaters do and add to the price.