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There’s a fight brewing in the lithium market, after a controversial forecast from Goldman Sachs Group analysts set off a backlash among some of the industry’s most prominent experts.

Lithium is a vital component of electric-vehicle batteries, which means the outlook for supply, demand and pricing is increasingly consequential. For years, a small group of niche consultants has dominated the conversation in a commodity that some say will become as important as oil in the coming century. Now, with prices surging and demand booming, they’re increasingly sharing the stage with Wall Street titans like Goldman.

The bank made headlines when it warned that a searing rally in lithium will go into reverse this year as supply from unconventional new sources overwhelms demand. Credit Suisse Group also joined in predicting a correction. But specialists including London-based Benchmark Mineral Intelligence are loudly pushing back.

The rift matters because both groups play important roles in the burgeoning electric-vehicle industry. The niche consultancies offer tailored research to miners, battery-makers and car companies that guides decisions about whether to invest in new projects, while the Wall Street banks — as well as the investors that read their research — help determine whether they can afford to do so.

Benchmark disputes Goldman’s forecast that a flood of new production is on its way, and that prices will crater as a result. The consultancy still sees prices retreating from recent sky-high levels, but takes a more pessimistic view on the scale and timing of new supply. The mining industry is famously bad at hitting its production targets and lithium has added risks to due to the highly complex technical processes involved in making the final products used in battery packs, Benchmark says.

“You’ve got this additional hurdle arising because it’s not a commodity, it’s a specialty chemical,’ Daisy Jennings-Gray, a senior price analyst at Benchmark, said by phone. ‘It’s a two-stage concern combining the traditional problems that the mining industry has faced with the additional challenges that a specialty chemical producer might face.”

The spat may seem trivial, but the stakes are high for those who rely on the forecasts, given lithium’s critical role in the electric-vehicle revolution and the wider fight against climate change.

If the deficits persist and prices spike further, it could cause carmakers’ margins to collapse, and potentially slow the mass roll out of electric vehicles. But if prices slump, miners could scrap major new projects, setting the stage for even larger spikes and deeper...