As of Jan. 1, one of the most common types of rechargeable batteries used in gadgets ranging from laptops to cell phones will be subject to new restrictions on American flights. New rules from the US Department of Transportation will limit the size and number of lithium batteries allowed, as well as laying out other stipulations for safely travelling with them.
Under the new rules, spare batteries (those not installed in any device) can no longer be carried in checked luggage. If they are to be brought along, they must be packed in a carry-on, with packaging tips to be followed in order to keep their contacts from touching metal and causing a short. The Department of Transportation generally recommends keeping them in their original packaging, or a plastic bag if need be.
