Coal baron and Queensland businessman Brian Flannery has sold his 5 per cent stake in fast-charger developer Tritium, casting further doubt on the financial future of the Brisbane-based company.

With shares of the Nasdaq-listed company trading at record lows and negotiations with Taiwanese electronics giant Lite-On Technology yet to come to fruition, the sell-down by one of Tritium’s biggest individual shareholders is another blow to the technology company which has struggled since it floated on Wall Street almost three years ago.