The document discusses battery technologies for solar PV projects in the megawatt range. It notes that while battery projects of several megawatt hours exist, no current battery technology meets the demanding performance requirements for grid-scale energy storage in terms of high power output, long lifetime, and low cost. Batteries currently account for less than 1% of global installed electrical energy storage capacity due to their high costs. Examples of existing large battery projects using different technologies and their capacities are provided.