AA-9V, AAA, C, D alkaline, carbon zinc, silver oxide and nickel metal hydride batteries are allowed in checked and carry-on baggage as long as they are packed to prevent short circuiting.
Personal devices (except for e-cigarettes and personal vaporizers) installed with a lithium battery of less than 100 watt hours are permitted in carry-on and checked baggage. Loose lithium batteries are not permitted in checked baggage on any United flight. Each spare lithium battery in carry-on baggage must be individually protected to prevent short circuits. To do this, you can place each battery in original retail packaging, place each battery in a separate plastic bag or protective pouch, or insulate the batteries by taping over exposed terminals. Spare batteries must not come in contact with metal objects, such as coins, keys or jewelry, and you should take steps to prevent crushing, puncturing, or putting pressure on the battery.
In most cases, up to two larger lithium batteries (more than 100 watt hours, but not exceeding 160 watt hours) are permitted in carry-on baggage if the terminals are properly covered or insulated. If you are traveling with a battery-operated mobility device, please see our Special Travel Needs section.
If carry-on baggage is checked at the gate, any lithium batteries and power banks must be removed.
For the most updated information regarding lithium batteries, visit DOT's Safe Travel page and the FAA's website.
Please see the Recreational self-propelled vehicles, hoverboards and riding suitcases section below for the latest information.
See the Lighters, matches and e-cigarettes section below for information about e-cigarettes and personal vaporizers.
Traveling to or from Japan
The Japanese Ministry of Land, Infrastructure, Transport and Tourism (MLIT) also has some additional restrictions on batteries and battery-operated items. For more information, see the MLIT website in English (PDF: 78 KB) or the MLIT website in Japanese (PDF 593 KB)