SEOUL, Sept. 9 (UPI) -- South Korean companies are trying to weather the prolonged slump in the global battery industry by partnering with leading corporations in Europe and the United States. SK On announced last week that it had secured an order from Flatiron Energy Development of the United States to deliver lithium iron phosphate, or LFP, batteries for use in energy storage systems, know as ESS. Under the agreement, SK On will supply up to 7.2 gigawatt-hours of ESS batteries between 2026