bad pruis battery module identifcation

hello everyone!

my question is simple! if i had a toyota pruis module in my hands and i wanted to test if its good or not; how can i do that?

(so when buying these modules to make sure they are good and im not sold a damaged modules!)

and for how long do these modules stay in a good condition (working) when they are not installed in a car ( when bought off-shelf )?

thnks!