And as far as what Titus is referring to, I would also consider that there "MAY" be a bit of over-simplification and 'sales pitch' from the battery manufacturers, with respect to quicker charging and long battery life. They do have a horse in that race, and an interest in the outcome, which may slant their method of explaining things that some totally independent observer may not completely agree with.
I think the battery manufacturers equations don't value the possibility of years 5 to 9, in a batteries possible useful life, as much as (say) an single truck end user may.