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Tesla in talks with BMW about batteries, charging collaborations

With Toyota and Daimler no longer holding Tesla shares, the electric vehicle company might be looking for a new partner – possibly a Bavarian one. In a new interview with Germany's Der Spiegel, CEO Elon Musk confirmed that he has had talks with BMW execs about future collaboration. "We are talking about whether we can collaborate in battery technology or charging stations," Musk said in the interview, according to Reuters. However, a Tesla spokesperson has tempered things by saying no formal agreements are in place at the moment. In the same interview, Musk reportedly praised BMW's use of carbon-fiber-reinforced plastic in its i sub-brand offerings, and said he would like to have a battery factory in Germany in the next five or six years. The possibility of technological cooperation between Tesla and BMW has been a hot topic this year. In June, Musk reportedly met with BMW execs, and the two companies were also rumored to have met with Nissan to discuss charging technology. When Daimler sold off its shares, there was talk of it opening the way for possible collaboration between the two automakers, as well.

Next BMW 4 Series convertible may ditch folding hardtop

In 2007 the E93 BMW 3 Series convertible switched from a fabric roof to a folding hardtop, but reports out of Germany and BMW say that the next-generation 4 Series convertible will go back to a fabric roof. AutoBild disclosed that nugget last month, now BMW Blog says a BMW source told their sister German publication BimmerToday that it's official and "a decision has already been made." The official car of pro tennis clubs around the world, the droptop 4 Series isn't due in dealers until 2020 or 2021 so one would think there remains some leeway about the top. However, teams of designers are working on the new car right now, so it's entirely possible that a design course is fixed. From the time that the model made the switch, fabric roofs have got so good that there is barely, if any, penalty for using them. It's supposed the change is being made to save weight and free up space. The next 4 Series range is aiming for a lot more sportiness, so on top of its CLAR (cluster architecture) body, it's expected to get active steering, adjustable dampers and anti-roll bars, bigger brakes, and brake-based torque vectoring. Detail improvements like reduced-friction wheel bearings, and faster torque transfer for its all-wheel-drive system are on the long list of upgrades. So too are aluminum and carbon fiber wheels, which will likely be developments based on the carbon wheels BMW showed off last year. Driver assistance options will be legion, with remote-controlled parking, semi-autonomous driving up to 40 mph, and hands-free overtaking perhaps among them.

BMW makes the M4 extra special with a huge wing

BMW has all of the bases covered in its lineup, especially when it comes to its 4 Series models. Don't like going to the track? There's the BMW 430i and 440i, which are available as a coupe and gran coupe. Drivers looking for a track-friendly car that can also be used on the road will be steered toward the M4. BMW even built the hardcore M4 GTS for drivers that spend all of their time on a track. Now, it looks like BMW is trying to bridge the gap between the M4 and the M4 GTS with a special-edition model. Our photographers caught BMW testing an M4 with some extreme aerodynamic components around the Nurburgring. With its aggressive front end, massive wing, and sporty rear diffuser, the prototype M4 appears to be similar to the special-edition M4 Competition Sport that BMW released in Spain. The Spain-only special edition was marketed as a softer version of the M4 GTS with less power and usable rear seats. With a similar look and visible rear seats, this prototype indicates a similar track-focused special edition model. Since the M4 is only a few years old, it's unlikely that BMW is testing a new model, but the automaker could be testing aerodynamic components for a refreshed model down the road. A cheaper, more usable M4 GTS, though, would be the perfect car to round out BMW's current lineup. Related Video: