In 2001, NMC lithium batteries measured an improvement rate of 54%/yr against hydrogen fuel cells' 21% and the combustion engine's 11%. Everything the industry learned over the next two decades matched that one reading.
Every rate reading below is what the platform computes from patents public in that year, the value a subscriber would have seen at the time.
GM tours its AUTOnomy fuel-cell concept; OEMs and oil majors align on fuel cells as the endgame for the car. The first platform reading already disagrees.
The U.S. announces the $1.2B Hydrogen Fuel Initiative in the State of the Union address; the FreedomCAR partnership pairs the DOE with Detroit. That same year, Tesla Motors is incorporated.
Tesla's first car proves a lithium pack can move a highway car. Hydrogen filings reach 2,896 families that year, out-filing the combustion engine itself.
Energy Secretary Steven Chu cuts fuel-cell vehicle funding, citing infrastructure and timelines; Congress partially restores it. The consensus fights the evidence.
Toyota ships the first mass-produced fuel-cell sedan and, months later, releases 5,680 fuel-cell patents royalty-free to seed an ecosystem. NMC has now out-improved hydrogen for 13 consecutive years.
Battery EVs approach a tenth of global new-car sales and Tesla becomes the most valuable carmaker in history. Fuel-cell passenger cars remain below one in a thousand sales.
Hydrogen filings run at 2,841 families per year against NMC's 504. Filing volume was never the signal, for 25 years it pointed at the wrong technology.
In 2003 these were serious arguments, made by serious engineers. None of them measured the one variable that decided the outcome.
Hydrogen carries roughly three times the energy of gasoline per kilogram; batteries were an order of magnitude behind. True, and irrelevant to the speed at which the gap was closing.
A fuel-cell car refuels in minutes; charging took a night. The rate said pack cost and charging performance were compounding at 50%+ per year, the objection had a measurable expiry date.
A serious infrastructure argument, made before smart charging existed. Infrastructure follows the technology that is improving fastest, not the other way around.
OEMs, oil majors and governments co-funded the technology, the filing charts prove how real that consensus was. Consensus is a patent count. It is not a forecast.
We forecast the improvement rate from two citation metrics, cycle time and knowledge flow. Both were visible the whole time.
NMC's cycle time ran at four to five years against the combustion engine's twelve to thirteen, a new invention generation three times as often. And its knowledge flow climbed to double the combustion engine's: each generation carried more of the field forward. Fast steps, big steps: that is what a 54%-per-year technology looks like underneath.
Provenance. Every patent carries a filing date, so the record can be replayed: every improvement rate on this page uses only the patents that were public at the time. No hindsight enters the series. Chart data: GetFocus platform exports, August 2026. The historical facts below come from the public record.
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