3 tons,
I guess you forget that I've posted numerous times on telcom jars so anyone with your vast knowledge of batteries would know about them.
However, just for you, when a string of batteries in a cell site has one battery go bad, all the batteries are replaced. These are true deep cycle batteries of the agm persuasion. The batteries which have not failed are "reconditioned" at Interstate Battery Stores and perhaps at other similar battery dealers. They are sold at a fraction of their original price. They come with a 3 month warranty.
From personal experience, I know they can survive being taken to just 8 volts (I don't recommend that). They can be charged at -40. They can provide up to 10 C for brief periods of time.
By the way I do use an Li battery--just not in my RV.
I do own and use an SiO2 as well. It is exposed to ambient temperatures year round.
For the record I do recommend LiFePO4 batteries when the climate allows it.
In future, please go and twist some one else's words. BKTDA