Video creator Two Bit da Vinci recently conducted hands-on durability tests of ProLogium's solid-state battery cells at the company's manufacturing facility in Taiwan [1].
The results are significant because solid-state batteries promise higher energy density and improved safety over traditional lithium-ion cells, potentially transforming electric vehicles.
During a visit lasting two days [3], the creator tested cells that ProLogium identifies as the first mass-produced solid-state batteries [1]. The testing included extreme stress tests, such as driving a nail through a cell, setting the electrolyte on fire, and cutting a cell in half. According to the video, these actions caused no incident [1].
ProLogium has spent 20 years developing this technology [2]. Third-party verified tests measured the energy density of the cells at 360 watt-hours per kilogram [1].
Despite these results, the industry remains divided on which company has achieved true mass production. Greater Bay Technology announced in late May 2026 that it produced the first all-solid-state EV battery cell on a full production line [4]. That specific cell enables an electric-vehicle range of 621 miles [5]. Meanwhile, in the U.S., ION Storage Systems reported that its Cornerstone Cell received customer approval for mass-production use [6].
These conflicting claims highlight a broader debate over the timeline of commercialization. While ProLogium is shipping cells at a gigawatt-hour scale [1], some industry leaders, including the CEO of Lotus, said solid-state batteries are still up to a decade away from widespread mass production [1]. Other critics, such as those at Donut Lab, said the safety and performance claims surrounding the technology do not add up [1].
“The testing included extreme stress tests, such as driving a nail through a cell.”
The race to commercialize solid-state batteries has entered a phase of contradictory claims, where multiple firms in Taiwan, China, and the U.S. all claim 'first' status for mass production. While individual cell tests show promising safety and energy density, the gap between a successful production line and a consumer-ready vehicle remains a point of contention among industry experts.
