SEOUL, Sept 4 (Reuters) - South Korea's SK On said on

Thursday it has signed a deal with U.S.-based Flatiron Energy

Development to supply lithium iron phosphate (LFP) batteries for

energy storage systems (ESS).

SK On, which supplies automakers including Hyundai Motor ( HYMLF )

, Kia Corp ( KIMTF ) and Ford Motor ( F ), said it

will supply up to 7.2 gigawatt hours (GWh) of ESS batteries

between 2026 and 2030.

The company did not disclose the value of the contract.

The company said in a statement that it will begin mass

production of ESS-dedicated LFP batteries in the second half of

next year, adding that it plans to convert some of its electric

vehicle (EV) battery production lines in Georgia for ESS use.