Charging Lithium

A year ago, I made the leap to lithium (LiFePO4). My lead AGM gave up the ghost, the result of a failed solar panel allowing it to go flat for too long. It was also long in the tooth. I wrenched my shoulder maneuvering it out of its hold, which was horribly located, so the decision was significantly based on its being half the weight. I'd read up on lithium. I picked one that had been vetted by a battery expert I trust. The BMS (battery management system) would cut off charging below freezing, which can be an issue for me. We've all been told that charging below freezing is bad, resulting in lithium plating. But ...32F has no particular significance to a system that does not contain water. It sounds like just a number that is easy to remember.I have read in several places that, in fact, it is a soft number, and that what matters is tapering off the charge rate at low temperatures. That at some low rate, charging in the cold is non-damaging. One source said 0.05C (5% of battery…