** Battery technology company Microvast Holdings' shares MVST.O rise 34.8% to $2.52 before the bell

** Co said it achieved significant milestone in its True All-Solid-State Battery (ASSB) technology of demonstrating stable operation at 12V-21V range

** ASSB technology uses bipolar stacking architecture for higher voltage output. Microvast said it eliminates need for liquid electrolytes, offering better safety and reliability

** Co finds use case of ASSB technology in data center backup power systems and electric school buses, along with robotics and electric vehicles

** Microvast will now start pilot production study to solve challenges in manufacturing

** Up to Wednesday's close, MVST is down 9.7% YTD

(Reporting by Rishi Kant in Bengaluru)

((Rishi.Kant@thomsonreuters.com))