You can bring 18650 lithium-ion batteries on a plane, but there are some restrictions. Here’s a summary:

  • Carry-on luggage: You can bring up to 2 spare 18650 batteries in your carry-on luggage. Each battery must be less than 100 watt hours (Wh).
  • Checked luggage: Lithium-ion batteries are not allowed in checked luggage.

Here are some additional tips for bringing 18650 batteries on a plane:

    • Keep the batteries in their original packaging or separate them with tape to prevent them from short-circuiting.
    • Label the batteries as “lithium-ion batteries”
    • Let the TSA officer know that you have lithium-ion batteries in your carry-on luggage when you go through security.

It is important to check with the airline you are flying with before you travel, as their policies may vary slightly. You can find the airline’s contact information on their website or by calling their customer service number.