The Pipeline and Hazardous Materials Safety Administration is issuing this advisory to inform the traveling public and airline employees about the importance of properly packing and handling batteries and battery-powered devices when they are carried aboard aircraft. Thousands of batteries and battery-powered devices are safely carried aboard passenger aircraft each day, but several recent incidents involving batteries in checked or carry-on baggage illustrate the risks of overheating and fire that can occur when the regulations are not followed. Federal regulations require that electrical storage batteries or battery-powered devices carried aboard passenger aircraft be properly packaged or protected to avoid short- circuiting or overheating. In this safety advisory, we suggest various practical measures for complying with the regulations and minimizing transportation risks. Recommended practices include keeping batteries installed in electronic devices; packing spare batteries in carry-on baggage; keeping spare batteries in their original retail packaging; separating batteries from other metallic objects such as keys, coins and jewelry by packing individual batteries in a sturdy plastic bag; securely packing battery-powered equipment in a manner to prevent accidental activation; and ensuring batteries are undamaged and purchased from reputable sources.