U.S. Air Force Senior Airman Maxwell Karline, 9th Maintenance Squadron electrical and environmental systems craftsmen, adds electrolyte solution to a battery cell using a narrow syringe prior to its initial charge, Aug. 16, 2023, at Beale Air Force Base, California. The U-2 Dragon Lady is the only airframe in the U.S. Air Force inventory that uses the silver zinc/potassium hydroxide battery, which requires intensive maintenance. (U.S. Air Force photo by Staff Sgt. Frederick A. Brown)
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