Some things that are banned from checked luggage are fairly self-explanatory. "It literally didn't cross my mind they wouldn't be allowed in the checked bag." In January 2021, new rules around batteries came into effect which mean any type of loose batteries are not allowed in carry-on luggage. Passengers were allowed one lighter on their person, with any additional lighters found in carry-on bags to be removed. E-cigarettes were another item that should only be packed in a carry-on bag, due to the risk it contained a battery.
Source: Stuff November 26, 2022 01:48 UTC