BTW, For those interested in LiFePo4 for cold weather applications but have exterior unheated battery compartments, I just ran across this heating blanket which can be easily repurposed to heat a Li battery (per Expion) with the addition of a simple thermostatic switch. These heating blankets come in either 12 or 120v versions.
Blanket choices from Amazon:
https://www.amazon.com/gp/product/B01N7QVBJJ/ref=as_li_ss_tl?ie=UTF8&linkCode=sl1&tag=melmikstrucam-20&linkId=8e2d19695250a95c07cae395b2a99353&language=en_US&th=1
Thermostat Switch at Expion’s site:
One Battery Heater Switch (Part No. EV-V120-BHS $8.00 ea. Retail plus shipping).
Expion also sells thermal insulating blankets.
Available at: https://www.expion360.com
3 tons