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| p.1 #2 · Air travel with large batttery? |
Most airlines have an info web site that tells you what you're allowed to carry in both checked luggage and in your carry-on. I often travel with tons of NiMH and Li-ion batteries in my carry-on, but they're relatively small; AA, LP-E4, LP-E6, NP-W126, and NP-95.
It's possible that you won't be allowed to bring it on the plane, at all. For example, see
When I used to do "sea trials" with wave bouys, we'd ship the buoy(s) to a remote location by land or air, and buy the 'car' batteries for them on site. Large batteries (even 'sealed') are classified as dangerous goods for land and air shipping. Of course, these were really big batteries.