I'm guessing sod is state of discharge. The discharge curve is not linear meaning that if voltage reduces by 10% capacity of 10% has not been used. Somantics.
I store/charge lipos like gambling- only bet what you can afford to lose and manage risks. I therefore charge and store in a fire proof container (old cooker) and that is in the shed. Can't really afford to lose the shed but compared to the house I can!