** Shares of Altech Batteries ATC.AX rise as much as 42.2% to A$0.047, their biggest intraday pct gain since October 1 , 2024
** Highest level since March 3
** Stock last up 39.4%
** Battery tech firm signs collaboration agreement with AMPower to sell sodium nickel chloride (SNC) batteries, targeting early market entry into Europe, Australia & USA
** SNC batteries, valued for their safety, durability are used in energy storage systems, electric vehicles
** About 14.8 mln shares traded so far, 6.7x 30-day average
** YTD stock down 11.7%, including current session's move
(Reporting by Ananya Verma in Bengaluru)
((ananya.verma@thomsonreuters.com;))