Li-S Energy (ASX:LIS) will evaluate the performance of its lithium-sulfur battery cells using UK-based undersea systems specialist MSubs' technology for use in uncrewed underwater vehicle platforms, according to a Wednesday Australian bourse filing.

MSubs will transport its specialized pressure-test chamber to Li-S Energy's Victoria facility, where it will test its lithium-sulfur battery cells under simulated deep-ocean conditions equivalent to hundreds or even thousands of meters of water pressure, the filing said.

After pressure testing, the firms will collaborate to conduct mission-profile tests that simulate multi-day operational deployments typical of unmanned undersea missions. If these tests are successful, they will explore the integration of Li-S Energy's batteries as a primary propulsion power source for specific MSubs platforms, and for inclusion in future vehicle designs.

The shares of the firm climbed above 3% in recent trading on Wednesday.