A federal auto safety agency has opened an investigation into Korean manufacturer LG Energy Solution’s high-voltage electric-vehicle batteries after their internal failures in several vehicle models led to fire risks and recalls. The inquiry by the National Highway Traffic Safety Administration launched on Friday affects 138,324 vehicles. The action seeks to notify other automakers that could have defective batteries in their vehicles from LGES and ensure any safety recalls are conducted if needed, according to a summary of the probe. It’s a more aggressive step by the agency after it told The…