In support of my above comment, I invite you to research the Toyota Highlander EV hybrid and it's Ni-MH battery pack.
The company that bought the patent for the Ni-MH batteries that were in use, as I understand it, will not allow battery sizes to be sold that are sufficient to power a vehicle, for whatever reason. Toyota, as a result, was forced to stop production of the Ni-MH battery pack in the Highlander EV, and since Ni-MH was the only viable choice for them at the time, subsequently canceled the Highlander EV altogether.
__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"