In the UK as long as your batteries are within the limits set here :-
[URL unfurl="true"]https://www.caa.co.uk/Passengers/Before-you-fly/Baggage/Items-that-are-allowed-in-baggage/[/URL]
Then you can fly, regardless of what the specific airline says.
Seen lots of airline state stupid things like no lithium batteries or some even saying no drones, blah blah.
Reality is if you pass security you will be flying - it is at security they are checking you against the rules set by the CAA and items that can be carried with you.
Only thing to be careful with is the rules of the civil avaitaion authority of the country you will be flying back from, as some may differ - however I have generally found most of these rules are pretty much aligned between all the aviation authorities I have seen.
