Purchase all of your batteries from reputable sources. A counterfeit battery is more likely to start a fire than an authorized manufacturer's battery. Look for Underwriters Laboratories (UL) or International Electrotechnical Commission (IEC) markings on the battery to ensure that they have been tested by a reputable company. Only use battery sizes and types authorized for use in your electronic device.
Remove the batteries from all electronic devices that you do not intend to use during the flight. Place each battery in its own case, bag or package. Place any electronic devices with the batteries installed in a separate case or section of the carry-on than other electronic devices with batteries. This prevents batteries from coming in contact with other batteries and metals, which can spark, cause a fire or cause the battery to short.
Keep all batteries and battery-powered equipment with you or in your carry-on baggage. If the batteries catch fire, the crew has better access to your carry-on luggage than to your checked baggage. The TSA reports that as of January 1, 2008, loose lithium batteries are no longer allowed in checked baggage.
Place your carry-on luggage or batteries in a safe area, taking care to prevent them from being crushed or punctured. A carry-on is safer in the overhead luggage compartment than by your feet.
