I'd be interested in an examination of how the purchasers and vendors of these battery storage installations manage the balance of capacity and life expectancy

I'd be interested in an examination of how the purchasers and vendors of these battery storage installations manage the balance of capacity and life expectancy vs wasted cost. If you build an installation that exactly matches your needs, you're putting a full charge cycle on the batteries on a regular basis, which reduces their ultimate lifespan and limits your ability to cope with unusual power demands. On the other hand, if you overbuild for your needs, you increase the total lifespan of the installation and your emergency capacity but at the cost of greater initial investment as well as the inescapable fact that even the unused portion of the capacity has a finite lifespan which is always (very slowly) expiring regardless of whether it's being used, so your per-dollar lifespan could be lower with a larger capacity. I'm also interested in how well real-world installations are matching the expected figures when it comes to amortized cost and life expectancy. Does the operating budget for something like the Hornsdale Power Reserve include the cost of replacing the entire thing when its cells are worn out in 10-15 years?