Once a car company ceases to manufacture a particular model, it is relegated to history, largely forgotten by its maker. Sure, warranties are honored and recall-worthy items are (hopefully) taken responsibility for, but post-production improvements are left up owners and the aftermarket. With the announcement of the Roadster 3.0 package, Tesla once again reminds us it is not most car companies.

Following a heads-up given by CEO Elon Musk last week on Twitter, the company has now shared some details of a new upgrade it will be making available for its electric sports coupe sometime in 2015. For a yet-to-be-disclosed price, owners can opt to have their cars upgraded with a 70-kWh battery, some aerodynamically-optimized body bits and low-rolling resistance tires. Together, the enhancements should offer a 40-50 percent range improvement and give Roadsters a 400-mile range under certain conditions. Originally, it came with a 56-kWh unit and was rated for 245 miles on a charge.

Tesla tells us that "this is a retrofit package currently in its prototype phase", and so it still isn't clear whether the changes will allow Roadsters to be compatible with the Supercharger network, or whether the body kit will affect the outward appearance. We do know that this automotive augmentation does not also apply to the Model S, though it does give hope that those cars will also be on the receiving end of similar upgrades in the future.

The California company plans to put its 3.0 package to the test sometime early in the new year, with a road trip from San Francisco to Los Angeles. Interestingly, it says that this will not be the last time it offers improvements for its original model. You can get more details on the update below.