Hello guys! I might be going on a school trip to UK for 2 weeks around mid March. London, Oxford, Manchester. Would be great if we could have a little chat, however I didn’t start this thread to organize a meet up but regarding transit. I wanna bring 4 or 5 lights for the trip. So I’ll need to bring batteries and a charger. I’m concerned if security wouldn’t allow me to board the plane with my batteries. I might be taking SIA or maybe Lufthansa I’m not sure… Will there be any problems with me bringing along like 8 spare batteries? I’ll be bringing an Acebeam K40M, modded 750N1, C22C and the BLF A6, maybe plus a dedomed L4…. Should be aware of anything? it’ll be my first flying with lights. I got reprimanded before for bringing like 25 AA batteries with me as the security was suspicious but my camera ate AAs like they were nothing. Every 15 shots I had to change the batts but the security was satisfied with my answer and told me not to bring too many next time eeven tho that bag was carry on… Hmmm
Lithiums go in hand luggage and should be OK. Are you sure you need all these lights on a school trip?
you can not have lithiums in checked baggage.
why should security question that many batteries? Don’t think there is a maximum?
edit: apparently there are limits:
https://www.faa.gov/about/initiatives/hazmat_safety/more_info/?hazmat=7
Heh I love my lights and I play with them every night no matter the need! So I can’t be away from them. I get attached to objects more easily than to people 
I’m not even planning to check my batteries and lights into my luggage. They will ALWAYS stay with me…
The FAA, the CAA, and the chosen Airline will all have a say here so you’ll have to check them all. And the rules are changing with several major US carriers as they do have the right to impose higher safety standards if they choose to. Check all of these when making your initial plans and re-check them just before you depart (and return). Although this stuff isn’t big and doesn’t weigh a lot, you’re going to have weight restrictions and if you have to pay overweight or oversize baggage charges you’ll be crying a sad tune as you try to figure out what to dump or whether it’s really worth another hundred to keep it all. And there are no places in an airport where you can safely dispose of Lithium batteries so that has to be handled ahead of time. Common cell sizes like AA or C might be best bought after arrival, but some sizes are hard to find overseas; check ahead.
And prepare for some really good beers, ales, and stouts which are going to ruin your appetite for what we’ve got here forever 
Phil
the airplane itself must be using lithium ion battery too isn’t? for comm and black box.
so you just like fly inside a big iron bird that attached with lithium ion battery as its support system 
Thanks Phil. So I guess I’ll just bring extra 4 batteries then. I won’t be carrying AA cells. Sorry man, I’m a Muslim and I can’t drink 
At least I don’t think I’ll hv problems w weight as most of my expensive stuff will be carry on, including my camera…
Some airliners such as Boeing 787 use only LiIon batteries for emergency power and that’s on the rise. Airbus and the others are switching over now. But those are very different than what we use; they are more harshly tested and swapped out on a schedule. Plus they are contained in a safe manner in case of thermal runaway or venting. Most airliners still use NiMh and will likely stay that way until the end of their service life as it’s very costly to re-certify a change like this with the needed authorities and it’s just not worth doing. And some of the really old planes still use an APU which is either started in-air as needed or must be running before taxiing for takeoff for their reserve power.
With the current failure rate, I don’t like having my life hanging on LiIon reserve power but you generally don’t have much choice and so far it’s worked. You just don’t know what you’re getting into when you fly. One of the last 4 planes I was on had a dead APU and it was ‘signed off’ for later repairs- a common happening. Had we lost both engines even temporarily we’d have all been dead without it; that plane has to have electrical power to fly at all just as most do these days. We’re precious little safer in the air than we were 10 years ago if at all. But that is a pretty good record so we fly anyway!
Phil
I gave up alcohol myself over 12 years ago, but I did get to experience some of the finest beers and liquor made back then. I just can’t go there now or I’ll never come back and that’s a trip I don’t want to take!
Phil