> Longer duration battery storage is going to be very hard to make work financially since the capital costs are spread across far fewer charge/discharge cycles.

> Longer duration battery storage is going to be very hard to make work financially since the capital costs are spread across far fewer charge/discharge cycles. The same argument could be applied to solar panels (25 year warranty) or fibre optic cables. But as so many solar panels are required they will be producing them for decades before the market is saturated. Of course after decades the old ones have indeed started dying, so it isn't an issue.