Tesla shares slumped 7.5% in early Wednesday trading, wiping out more than $30 billion in market value from Tuesday’s close. Analysts and investors divided over whether Musk can deliver on his visions of novel, proprietary Tesla batteries that could make electric cars competitive with mass market, petroleum-fueled cars. Some analysts praised Tesla’s impressive technology, capacity and cost targets. But others said Musk’s promises lacked substance and questioned the three-year timeline he outlined for delivering the promised breakthroughs. Musk acknowledged that some of Tesla’s ambitious technology is proving “insanely difficult” to manufacture at high volume. Investors had expected two big announcements from Musk: the development of a “million mile” battery good for 10 years or more, and a specific cost-reduction target - expressed in dollars per kilowatt-hour - that would finally drop the price of an electric vehicle below that of a gasoline car. They got neither from the event, with Musk promising a $25,000 car three years down the line that would “basically be on par” with a gasoline car. Musk has promised such a car for years. ADVERTISEMENT Analysts from Swiss banking group UBS said that promise came with risks. “By the time (the car) arrives, there will be significant competition in the segment, from VW group, amongst others,” the bank’s analysts wrote in a note to clients. Volkswagen VOWG_p.DE on Wednesday unveiled its latest electric vehicle, the ID.4 sport utility and said it would be priced to sell in the United States for thousands less than a Tesla Model Y SUV. Tesla has yet to deliver a previously promised $35,000 Model 3 sedan. The lowest-range version of that car currently retails for nearly $38,000 in the United States, with narrow profit margins generally making inexpensive cars unattractive to automakers. RELATED COVERAGE Tesla could struggle to implement some of its battery advances, experts say Analysts also criticized that it would take at least another year to see some of Tesla’s battery innovations in production. Musk said the company was starting to ramp up the production of larger, more energy-dense cells at a California pilot facility, but acknowledged the process was not yet fully working. At $305, the average target price among the 33 brokerages who follow the company is another $100 lower and several brokerages emphasized that expectations for what the company could deliver were already out of whack with reality as the global economy heads into a potentially long-lasting recession. Morgan Stanley said Musk had shown substantial progress, but also laid bare the scale of the task in front of the company. “Elon can’t do it alone ... Tesla needs help to get there,” its analysts wrote, saying governments, suppliers, investors and engineering talent would have to support the company’s mission. ADVERTISEMENT Jed Dorsheimer, an analyst at Canaccord Genuity, said Tesla’s challenges to scale batteries and manufacturing capacity at affordable rates showed Tesla was a modern day auto, rather than a tech company with high valuations. Tesla’s Battery Day did yield some positive reviews, however. Analysts at Deutsche Bank said the three-year plan for achieving 56% reduction in battery costs could materially boost Tesla’s volume and margin outlook. The brokerage moved from the sidelines to assign a “buy” rating on the stock, and raised its price target to $500 from $400.