The seats are assigned. People have been standing in line for 15 minutes now. Why on earth would anyone want to stand there, when they could just sit and wait until the line clears?
I understand wanting to get off a plane ASAP, but boarding? You just end up sitting on the plane, waiting for everyone else to get on.
Once I'm in the air my backpack goes from under the seat to under my knees. Then I can stick my feet under the seat for that extra few inches of stretch. It's not a whole lot but it does help.
A lot of airlines nowadays seem to charge extra for a carry on than they do a checked bag. So I tend to bring one checked bag and one small backpack that can fit under the seat, which isn't classified as a carry on.
Yup yup, carry on and personal item. You can live for a week out of that. Plus no wait at the baggage claim, and no risk of the airline stealing or breaking your stuff.
That's only for cabin luggage. In checked luggage, Lithium Ion batteries are completely banned. If a battery bursts into flames in the cabin, it can be handled with hopefully minimal damage. You do not want that to happen in the belly of the plane packed in closely between everyone else's luggage with no way of getting it contained until the planes lands.
Well no because it depends on the airline.
I just checked an airline (Lufthansa) and they allow it for checked luggage up to 100Wh though do not recommend it.
Anything 100-160wh requires a permit from Lufthansa.
Spare (uninstalled) lithium ion and lithium metal batteries, including power banks and cell phone battery charging cases, must be carried in carry-on baggage only.
When portable electronic devices powered by lithium batteries are in checked baggage, they must be completely powered off and protected to prevent unintentional activation or damage.
Sounds like it is ok as long as they are powered off.
Most consumer personal electronic devices containing batteries are allowed in carry-on and checked baggage, including but not limited to cell phones, smart phones, data loggers, PDAs, electronic games, tablets, laptop computers, cameras, camcorders, watches, calculators, etc. This covers typical dry cell batteries, lithium metal, and lithium ion batteries for consumer electronics (AA, AAA, C, D, button cell, camera batteries, laptop batteries, etc.)
So it seems like they would prefer them to be on a carry-on but there isn't a rule against it.