The batteries from 2011 are Ni-Mh and not Li-Ion. Here the OEM batteries are warranted 15 years if maintained yearly (cost 60€] by Lexus. Meaning you pay 720€ to have a warranted battery 15 years; first years are warranted from factory. Li-Ion last less. Just ask drivers of electric cars.
Are proton batteries what we need in order not to make the climate worse by not doing anything that politicians are used to, while they only care about making money?
Li-ions and cobalt are not a solution, as the search for them is destroying the planet. It doesn't look like the climate situation will improve on its own.
https://www.hydrogenfuelnews.com/proton-battery-technology/8560049/