Detroit,  Tesla's second-quarter net income fell 45 percent compared with a year ago as the company's global electric vehicle sales tumbled despite price cuts and low-interest financing.

The Austin, Texas, company said Tuesday that it made $1.48 billion from April through June, less than the $2.7 billion it made in the same period of 2023. It was Tesla's second-straight quarterly net income decline.

Second quarter revenue rose 2 percent to $25.5 billion, beating Wall Street estimates of $24.54 billion, according to FactSet. Excluding one time items, Tesla made 52 cents per share, below analyst expectations of 61 cents.

Shares of Tesla fell about 8 percent in trading after Tuesday's closing bell. The shares had been down more than 40 percent earlier in the year, but have since recovered most of the losses.

The company's widely watched gross profit margin, the percentage of revenue it gets to keep after expenses, fell once again to 18 percent. A year ago it was 18.2 percent, and it peaked at 29.1 percent in the first quarter of 2022.

Tesla said it posted record quarterly revenue "despite a difficult operating environment." The company's energy-storage business took in just over $3 billion in revenue, double the amount in the same period last year.

CEO Elon Musk, who has tried to portray Tesla as an autonomous vehicle, robotics, and artificial-intelligence company, told analysts on a conference call that the company's "Full Self Driving" system should be able to run without human supervision by the end of this year, although he acknowledged that his predictions "have been overly optimistic in the past."

At present, "Full Self Driving" is being tested on public roads by some Tesla owners. The company says it cannot drive itself and human drivers must be ready to intervene at all times.

But in investigative documents, the US National Highway Traffic Safety Administration said it found 75 crashes and one death involving "Full Self Driving." It's not clear whether the system was at fault.

Later, Musk said he did not think approval by government regulators would be a limiting factor in deploying robotaxis. "If you've got billions of miles that show that in the future, unsupervised FSD is safer than humans, what regulator could really stand in the way of that?" he asked.

Musk told analysts he postponed the company's August robotaxi unveil until Oct. 10 to make changes to improve the vehicle. He also said Tesla will show off a "couple of other things" at the event.

Musk said he expects Tesla to begin limited production of the Optimus humanoid robot early next year for use by Tesla. The robot already is doing work at a factory. In 2026, production would ramp up more to send robots to outside customers, he said.

Musk also said the company is on track to deliver its new more affordable vehicle in the first half of next year.

The company, he said, wants to wait until after the U.S. presidential election before deciding whether to build a new factory in Mexico. Republican nominee Donald Trump has threatened to slap tariffs on autos made in Mexico, so it wouldn't make sense to build there in that case, Musk said. Musk has endorsed Trump.

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