Its a well known and documented fact that TB48 are not permitted as carry on luggage. TB47 is what is acceptable, that is why DJI made the TB47 so it was within airline and aviation restrictions.
Well, that's not a "well known and documented fact" if you consider this:
https://www.faa.gov/about/office_or...edia/faa_airline_passengers_and_batteries.pdf
Just be aware that this is for the US (and subject to airline approval, so I suggest checking with your carrier before you fly). These FAA guidelines generally comply with ICAO rules, but there are many countries (and airports within those countries) that further restrict what can be carried in the cabin, so it's best to always check first, fly later.