Smartphones with batteries that fully charge in five minutes could be available to consumers next year.
The technology was first shown off in 2015, when Israeli start-up StoreDot demonstrated its FlashBattery at the CES tech show in Las Vegas.
Chief executive Doron Myersdorf told the BBC it is now expected to enter production in early 2018.
However, Ben Wood, a technology analyst at CCS Insight, said he had doubts about the claims.
Mr Myersdorf said he could not reveal which manufacturers were signed up to use the technology.
In 2015, he told the BBC his firm's battery contained materials that allowed for "non-traditional" reactions and the unusually fast transfer of ions from an anode to a cathode - the electrical process that charges a battery.
The design involves nanomaterials, which feature extremely small structures, and - unnamed - organic compounds.