What I meant is that current grid scale lithium ion battery storage projects are designed for at maximum a few hours between charge and discharge. They are mostly for shorter window grid stabilization, not to store energy for days or weeks.
LiIon grid scale batteries are still very expensive as a long term energy storage solution, they are sized to provide higher value grid ancillary services, like frequence regulation.
LiIon grid scale batteries are still very expensive as a long term energy storage solution, they are sized to provide higher value grid ancillary services, like frequence regulation.