Are you talking about existing standards or just generally possible technologies?
If general, there are too many variables and battery technologies for me to give a meaningful answer. There are battery technologies to really push the range, but they are not yet safety approved, and aren’t mass produced (yet) – research oddities. Also, there are energy storage technologies that exceed energy density of batteries (like flywheels, fusion, and capacitors, for example). There are maybe/possibly near-future things like ‘cold fusion’, which push the range beyond anything you can dream of (it depends how exotic you want to get).
