It’s not fully true - because if you read rules carefully you could find info that customs/airport security could stop you if you take a lot of devices - more than 2 notebooks, more than 1 action camera and etc. But I’m personally have no such negative experience - last time travelled with 3 action cams even it limited by law in my country.
Actually you are limited by Kw/h of your battery as said SoEFoil in first message.
And if your battery capacity less than limitation you could take few of them. This depends of country and even flight company. For example if you need transport high capacity cells for industrial drones it also regulated.
In any case it hard to make - all cells should be in storage mode, all contacts should be waterproofed.
Imagine you need transport 10kg battery - you need at least 4 friends to give all of them up to 2kg of lithium. Even I have LifePo4 battery which not so dangerous I couldn’t flight with it due restrictions.
I’m always travelling with fireproof bags and even with battery capacity calculation on paper to give it to airport security - this always save your time and saves nerves.
PS I’m already thought of some idea - we should share/create some universal connection method of battery and if we will have some Excel file with - location battery, it capacity and etc, we always could travel of all over the world and take batteries from our foil-friends who have desire to share their batteries in way like shared property in some community (I forgot the service which allows sharing property for free between members)
In this case you always will have a battery, company of hobbyist, beer and etc )
For example some DRONES hobby stores sharing for money their batteries - you could take few 6s to build required pack for you. Few years ago I have find few such stores in Europe. In our case foil/kite/supboards rent services could do this. If someone here are owner of such rentals be the first
I’m wondering why nobody create BatterySharingService… if some one will create it, please send me some % of your earnings for this idea
I’m pretty sure that some rental-hubs with batteries and charges for some $ will be good idea for efoil and ebike guys in future - and it will be banger for location like Canarias Islands, Malta, Madeira and etc.
Or we should wait few years for safe batteries.
PS a lot of post companies (90%+) limiting lithium batteries in their parcels so you also will not have a chance to transport it by airplane in parcel, so for example if I’m in Europe mainland and willing to foil on Ibiza I should deliver batteries by sea
I have ordered lithium from USA and China, and from Hobbyking (Netherlands) to Eastern Europe in the past, and wait them more than month because from USA it was delivered by the sea, and from China and Netherlands by train or car.