On my recent flights between the USA and Australia, they specifically advised not to check any batteries at all, so in my carry-on I had 5 drone batteries, 3 po

On my recent flights between the USA and Australia, they specifically advised not to check any batteries at all, so in my carry-on I had 5 drone batteries, 3 powerbanks and a mid-2015 MBP. The provided USB port couldn't charge my larger iPad, so the powerbanks were useful then.