Indeed, I meant 10S. And what I meant by load being distributed along more cells, is that since you have many more cells, current drawn from each is lower. Which greatly prolongs the lifetime.

And hence the question I had with charging too fast. Since discharging faster clearly wears them more quickly, surely charging faster has a similar effect, since it's mostly the reversed process? A question probably easily answered with a query to a LLM.

“Number of cells” doesn’t really tell you anything about current and how it will affect the battery. The number of cells in series gives you the nominal voltage of the entire battery, and the P number (number of cells in parallel) rarely tells you anything useful — three 2000 mAh cells in parallel are equivalent to one 6000 mah cell, and both approaches are valid and used.

What you care about is actually the mass of the cells, basically the total weight of the active material. More material means higher capacity and can withstand more current.

For example, my car is 104S and that’s it, no parallel connections, but the individual cells are huge (~170 Ah each).