You can't fly with Segway batteries even if they are sealed. The FAA prohibits carrying any form of lithium ion battery larger than 160 watt hours
https://www.faa.gov/about/initiative...info/?hazmat=7
A single Segway battery is about 385 watt hours
The Tesla batteries are contained in individual modules consisting of 444 Panasonic 18650 cells of about 3400 mAh nominal capacity. The cells are configured 6s74p, Voltage range for each module is about 24.9V at 100% SOC for a capacity of 250Ah, 5.3kWh. The cathodes are welded to a tube to enable them to be liquid cooled. Most people using them for home solar purposes buy however many modules they need and use them in their OEM configuration
My Mitsubishi EV's use large 50 Ah cells, 88 of them in series for a 16 Kwh pack
Don