There are already battery chemistries available that do not rely on lithium and drastically reduce the usage of other suplly-contrained inputs. Especially for stationary storage (where energy density and weight are not much of a concern) there is a wide array of technologies already available and in development.
And as you yourself say: once a battery has been built, it simply exists. There is a very gradual deterioration, but nothing even close to the "just in time" dependency that we are experiencing in this very moment when it comes to fossil fuels.
For a strategic independence point of view, being reliant on a global value chain to replace existing infrastructure every 15 years beats being reliant on a global value chain to replace your tank of gas every day by miles. Don't let perfect become the enemy of good!