They are a slightly different chemistry than LiPo batteries.
LiPo are used in remote controlled cars and airplanes and mostly, now, drones.
If LiPo batteries are punctured or over charged or under charged they give off a very high temperature stream of gas.
I believe around 600 degrees.
These batteries have none of those problems.
They were used in the Dewalt battery powered tools for awhile before the company building them almost went bust.
The company was A123 and I think they were rescued by a Chinese company.
Check their website www.a123systems.com
They use a very different charging system than the ones we have on our trailers.