Many battery packs can be rebuilt with new rechargeable cells. Not hard to do.
This. Middle son does this. It works.
And where does one get these new cells when one lives 2 hr drive from nowhere? Does your son have a link for where he gets his?
Geno
The desert is a true treasure for him who seeks refuge from men and the evil of men. In it is contentment In it is death and all you seek (Quoted from "The Bleeding of the Stone" Ibrahim Al-Koni)