Update: Rivian got back to us with the following reply regarding the Max Pack battery: "Instead of adding more cells or modules to an existing battery pack, which would add more mass, our engineers ...

Rivian has added the “Max pack” option to its R1S configurator, and added “Max pack” as a filter criteria to its R1 shop, suggesting that vehicles with the massive 400+-mile pack will be shipping soon ...

After removing the quad motor, Max pack R1T from its configurator last December, Rivian has followed through on its promise to deliver a higher horsepower “Performance” dual motor option to ...