Yes. I got into Lipos by necessity. I wanted to travel with the board but li-ions are too big so got Lipos and couldn’t believe the difference in performance. They hit harder, no voltage sag, more range than equivalent li-ions, cheaper and 10x easier to build.
This is my 4th set of lipos and I have flown around 15 times with lipos. They don’t even give it a second look at the airport. lol I have been through Barcelona, krakow, manchester, London and a few other airports with 5s, 3s, 4s setups. Max I have taken is 4 batteries and that’s the latest setup. 4 x 3s. Legally, you can take as many as you want under 99wh.
Regarding the LTT bms. I don’t like to change anything on the lipos themselves. Keep them as they come from the factory. Add balance lead extensions to the lipo balance leads which then go into the harness of the BMS. That way, just disconnect everything and the Lipos look legit.
the 4.15v thing, you can open your charger and some have a trim pot you can turn to bring the voltage down, or just keep an eye on the bms app and unplug when you get to around 4.15v. In the app, I set it to start balancing at 3.9v so by the time 4.15v comes along, cells are properly balanced. This Bluetooth BMS really is a lifesaver.