Gelonghui April 30 丨 Some investors sent a letter to Tuobang shares (002139) on the investor interactive platformmegamillionspot.SZ) Questionsmegamillionspot,"What is the progress of the research and development of sodium-ion solid-state batteries? When will it be available for sale?"megamillionspot, the company replied that it is not currently conducting solid-state battery layout. Sodium-ion batteries have been verified by some energy storage and small power customers, and the specific sales progress is related to market demand and customer orders.