Why Are Lithium Ion Batteries Not Allowed On Planes. Lithium batteries with more than 100 watt hours may be allowed in carry-on bags with airline approval. Lithium batteries can cause ignition and inextinguishable fires.
That is why they should be carried carefully in a separate bag. Those lithium batteries allowed are that that are used by passengers for example those on battery charges smartphones and tablets etc. At least two deadly cargo jet crashes have been blamed on fires caused by these batteries.
A fire caused by lithium-ion batteries is so enormous such that the system has proven not to put it out.
The US Department of Transportation and Federal Aviation Administration are banning people from storing lithium ion cells or batteries as cargo on passenger planes. For more information see the FAA regulations on batteries. Therefore loose lithium batteries are not allowed in checked bags. These limits allow for nearly all types of lithium batteries used by the average person in their electronic devices.
