I try and get 2 years out of them, paired batteries, (kicking the f@@k outa them, chain vaping) and relegate them to a single life for a year or so before putting them to rest in the recycle bin at a supermarket.
That is unless I end up killing them in a dodgy mod then they are straight to recycle as soon as I twig! The mod also gets a abandoned to gather dust. Only happened once in all my years of vaping so don't panic.