[scottz]

I also live in Colorado. In the winter, I keep my trailer plugged in (inside, but unheated storage) but I switch off the battery disconnect (my install) so the batteries are not charging all winter. I do not remove them. No issues yet after two winters with lithium batteries. I just have to remember to turn the switch back on before trying to move the slides or jacks; the converter does not have the juice to do it.