LOL! Stop and think what you just wrote.
It was a quote,not my personal opinion..Meaning,if you read the net enough and certain battery company specs and advice,yoy come up with some crazy stuff,including lifepo4..
I too have charged agm in all sorts of weather without any apparent damage,all lasting 5 years or so..But were talking inexpensive lifepo4 batteries...$300 for a true 100 amp hours(LFP) or $300 plus for 50-60 amp hours out of a quality agm like fullriver or ......CanBat batteries says not to charge below 0C(The above quote off there site)and ofcourse,most LFP say the same except there is a lot of chatter that charging LFP in the 20's at a low charge rate is okay..
I mean,who really knows..I have not seen anyone say they completely ruined a LFP by charging below 0C nor have I ever seen what CanBat battery claims of the lead acid batteries..
It's the internet,alot of opinions without a lot of actual trials for proof that I have seen....
Jayco..
