Despite the growing interest in advanced lithium batteries, the overwhelming majority of batteries manufactured today are still based on aqueous electrolytes, mostly sulphuric acid or potassium hydroxide solution. The ubiquitous lead-acid battery is, after 150 years, still being improved as regards its design and materials of construction. Rechargeable batteries based on potassium hydroxide electrolyte have nickel oxide or silver oxide positive electrodes and negatives of zinc, cadmium or iron metal, or hydrogen in the form of hydrogen-platinum electrodes or as metal hydrides. The most common by far is the nickel oxide-cadmium battery, although others find specialized applications. Progress in the development of the various aqueous electrolyte batteries is outlined, including novel batteries not yet in production (zinc-bromine, vanadium redox). Limitations (technical, economic and environmental) to the use of batteries are mentioned. Finally, reference is made to super- and ultra-capacitors and their intermediate role between rechargeable batteries and conventional capacitors.