Donut Lab, the Finnish startup that claims to have developed the world's first production-ready solid-state battery for vehicles, is back with new details.

In a new video published on the company's YouTube channel, Ville Piippo, the battery startup's co-founder and CTO, dives a little deeper into the solid-state pack that powers the Verge TS Pro Gen2 motorcycle. The companies say this is the world's first solid-state-powered electric bike, as well as the fastest-charging one.

The details don't include proof of the chemistry used in the mysterious and controversial cells, which have so far attracted a lot of attention. The company has made some wild claims, including an energy density of 400 watt-hours/kilogram, zero use of rare-earth materials, and a lifespan of 100,000 charge cycles. 

So far, the startup has failed to substantiate many of its claims with patents, relevant validation results, or a chemistry breakup that would prove it is, in fact, a solid-state cell, and experts are skeptical about the firm's figures.

But Donut has trickled out some details of its cells through a series of independent tests, and now it's talking about how those are assembled into an actual, vehicle-level battery pack. The latest video provides an interesting look at both Donut's tech, and the specific challenges of designing electric two-wheelers. 

The new Verge TS Pro, shown here in its Standard Range version, uses 192 of Donut Lab's 94 Wh cells, resulting in a nominal capacity of around 18 kilowatt-hours and a maximum capacity of approximately 20 kWh. There's also a Long Range version with roughly 30 kWh of nominal capacity, but the battery enclosure is the same size as the smaller pack.

In the 18 kWh model, each module has a 2P 96S configuration (2 cells in parallel and 96 cells in series), resulting in a maximum system voltage of around 400V. There are four modules in total, layered on top of each other in a slight offset. Heat transfer plates are mounted between each cell layer, which conduct the heat to the outside of the pack.

On each side of the pack, there is a heat sink and a small fan that looks like something you'd find on top of a PC processor. It helps dissipate the heat into the ambient air, making this an air-cooled battery pack.