I think grid storage does care: * Size is important, because they need to be stored and maintained somewhere. The larger the energy storage, the more infrastru

I think grid storage does care: * Size is important, because they need to be stored and maintained somewhere. The larger the energy storage, the more infrastructure required. * Weight typically scales cost (the heavier it is the more it costs). If it really weighs a lot, you need to reinforce the ground too. * Efficiency in charging and discharging. You also need to monitor the state of each cell carefully.