In the US, the TSA and FAA have limitations on how big of batteries you can bring - and you must carry them on. https://www.tsa.gov/travel/security-screening/w

In the US, the TSA and FAA have limitations on how big of batteries you can bring - and you must carry them on. https://www.tsa.gov/travel/security-screening/whatcanibring/items/lithium-batteries-more-100-watt-hours https://www.tsa.gov/travel/security-screening/whatcanibring/... https://www.faa.gov/hazmat/packsafe/more_info/?hazmat=7 https://www.faa.gov/hazmat/packsafe/more_info/?hazmat=7