Sodium batteries, if the technology works, would replace EV batteries and provide support to the electrical grid, and would be purchased at thousands of times the volume of iphone ad laptop batteries
But their impact on energy storage to stabilize the grid, both technically and in terms of prices, can not be overstated. Cheap, safe storage is the key component missing in Europe for using more renewables. Without that you need to keep gas plants in reserve, should there be a few days without sun and wind.
There were a few such days in December 2024, and their impact onto energy prices is difficult for energy-intense industries. https://energy-charts.info/charts/price_average/chart.htm?l=...