Battery costs have declined by 99% in the last three decades, with over 20 million electric cars sold globally in 2025 at prices as low as $10,000. The global cumulative production of batteries has increased significantly since 1991, with prices dropping by roughly 19% every time production doubled. Cheaper storage solutions, particularly lithium-ion batteries, have enabled the widespread adoption of renewable energy and electrified transport, transforming the industry from niche technology to mainstream use. The decline in battery costs has made electrified transport a reality, with batteries now powering cars, homes, and power grids worldwide, emphasizing the importance of continued innovation in this area for a low-carbon energy system.