A relatively new field, nanotechnology has seen an expansion onto almost every scientific sector since its origin in the 1980s. This work focuses on the potential of nanotechnology in batteries, in particular, with a review of the current and past developments in the field. For smaller applications using lithium-ion batteries (LIBs), it appears that nanotechnology has established a firm foothold. The possibilities for mainstreaming this advance in large batteries, e.g., grid batteries are researched, and developments to date are reported. Viable grid batteries are the key to adapting wind, water, and solar (WWS) sources of energy for the power grid since none of these WWS resources are available every single hour of the day and night.