The new lithium extent limits pertain to both standby as well as batteries installed in different gadgets. Nevertheless, the ban is not applicable on electronics consumer items like cameras, cell phones and laptop computers which are also powered by lithium batteries.

Specifically speaking, the Federal Aviation Administration and the But the Transportation Security Administration (TSA) are not worried about loose or spare lithium batteries being carried by passengers in the flights.

In fact, they are more concerned about the batteries with uncovered electrical contacts, which, if touched by other metal objects could bring about an explosion and fire during a flight. Hence, the two agencies want to make sure that any spare lithium batteries that the passengers take with them on their flights meet their new standards.

Although the rules permit the travelers from carrying spare lithium batteries in their luggage, one is allowed to carry lithium batteries in his luggage up to a certain extent.

The new Federal Aviation Administration rules express the limits in grams of "equivalent lithium content" stating that eight grams of equivalent lithium content is approximately 100 watt-hours; while 25 grams is approximately 300 watt-hours.

The new rules state that only two additional spare rechargeable lithium batteries would be allowed on airplanes per passenger. The passengers would be required to pack these loose batteries in plastic batters in carry-on bags for safety.

Sources said that the US administration is considering lithium batteries as dangerous materials since they're known for overheating and catching fire in some conditions. Examination conducted by the Federal Aviation Administration have shown that aircraft cargo fire suppression systems on airplanes are unable to douse fires caused by non-rechargeable lithium batteries wrap up in mass quantities.

In fact, even a small fire source is enough to heat a lithium battery. According to a report published by the Office of Aviation Research in June 2004, in such situations the external plastic covering of the battery can liquefy easily and combine with other neighboring batteries to enhance the potency of the fire.
 

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