this is why
Hi Folks, This is why Li batteries are not a good fit for me. https://weather.gc.ca/city/pages/sk-32_metric_e.html -40 on Wednesday night.
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You could use a battery wrap heater on a car battery in that kind of weather. I wouldn't be getting lithium battery's either, we do cold camping here in Colorado and my battery's stay on the camper tongue of the trailer year round.