First it giveth, then it taketh away. Just as the A3 Sportback e-tron’s production plans emerged, the Audi R8 e-tron has officially been classified as a stillborn. Autocar UK reports that Audi has no plans to sell the all-electric sports car, and the 10 that have been built will be used only for internal testing and development work.

Audi cites the high cost of batteries and lack of advancement in the field as the main reasons why the R8 e-tron is not quite production-feasible just yet. Battery technology hasn’t picked up as quickly as Audi expected, nor has the cost fallen as initially forecasted. Too bad then, as the prototype showed a lot of promise.

With strong electric motors powering each of the rear wheels, it could cover the 0-100 km/h sprint in 4.2 seconds, on to a governed top speed of 200 km/h. Combined power output is 375 hp and 820 Nm of torque, while Audi’s ultra lightweight construction gives it an optimal range of 215 km. You can study all the high tech details in the diagrams below.

The R8 e-tron has never been slated for production, not officially at least. But it’s only natural that if Audi is ever going to build an all-electric car, the R8 sports car should be the one it’s based on. It was Tony Stark’s car of choice after all. Till technology caches up, then. Should be all time.