BYD's stock jumped 4% in Hong Kong after the Chinese EV maker teased a 'disruptive technology' announcement despite reporting a 41% sales decline in February. The company plans to reveal details at its Shenzhen headquarters later this week, with rumors pointing to megawatt-level flash-charging infrastructure.

BYD's February sales fell to 190,190 new energy vehicles, down from the previous year, according to Chinese EV blog CnEVPost. The drop includes a 36.3% decline in pure EV sales to 79,539 units. Industry analysts attribute much of the decline to the Chinese New Year holiday, which fell in mid-February this year compared to January last year.

The timing of BYD's technology announcement raises questions about the company's strategy amid challenging sales conditions. The teaser comes as Tesla prepares to release its production data through China's CPCA authority, with Tesla's January sales showing a 29% month-over-month decline despite a 9.3% year-over-year increase.