Beijing HyperStrong Technology's (SHA:688411) net profit attributable to shareholders in the first half doubled to 632.2 million yuan from 315.8 million yuan a year earlier, according to a Shanghai bourse filing on Thursday.
Earnings per share jumped 91% year on year to 3.47 yuan from 1.82 yuan.
Operating revenue rose 39% to 6.30 billion yuan from 4.52 billion yuan in the previous year.
The Chinese energy storage system manufacturer's shares fell 2% at the close.