We’ve heard the promise for years. Solid-state batteries will change everything. Faster charging, safer chemistry, less heat. The problem is that most announcements never show real-world evidence.
This time might be the real deal, however, because…
Donut Lab just did.
The company commissioned independent testing from the Technology Research Centre VTT, and the early results are eye-opening. In controlled lab conditions, the prototype battery reached 80% charge in about 4.5 minutes and full charge in just over seven minutes during extreme-speed testing.
That is not incremental progress. That is a different relationship with charging entirely.
Why this matters
Current lithium-ion batteries typically charge at around 1C to 3C rates, which translates to roughly an hour down to maybe 20 minutes on modern fast-charging phones.
The Donut solid-state cell was tested at up to 11°C without active cooling and still retained nearly all of its capacity after charging.
In simpler terms, the battery handled extremely aggressive charging while staying stable enough to remain usable. Not just speed, but speed without destroying the battery.
Even at a more moderate rapid charge test, the cell still reached 80% in under ten minutes and fully charged shortly after, again retaining full usable capacity.
The engineering advantage
One of the biggest barriers to the development of solid-state batteries has been complexity. Many designs require heavy compression and elaborate cooling systems to avoid expansion during charging.
This design apparently avoids that. The battery uses passive cooling and does not require strong compression forces, which could make battery packs simpler and cheaper to build.
That matters because breakthroughs only change devices when manufacturers can actually ship them at scale.
What it could mean for phones
If results like this translate into consumer electronics, charging stops being a daily habit.
- Plug in while making coffee, and you are done.
- Airport gate charge, and you are done.
- Forgot overnight charging, and it no longer matters.
Battery life becomes less about capacity and more about availability. Devices could stay thin because you do not need enormous cells if refilling them takes minutes.
Takeaway
We are still early. This is a cell test, not a finished smartphone battery pack. But independent verification makes it one of the more credible solid-state developments we have seen in years.
If it scales, charging speeds might finally reach the point where we stop thinking about charging at all. That would be one of the biggest usability upgrades smartphones have had in a decade.
