Aqueous battery

An aqueous battery is an electric battery that uses a water-based solution as an electrolyte. Aqueous batteries have existed since the 1860s. While most designs do not have the energy density and cycle life required by typical use cases (grid storage and electric vehicles), they are generally considered safer, more reliable and relatively inexpensive in comparison to lithium-ion batteries. Until the 2010s, aqueous batteries also found a niche in high-power applications like cordless power tools, but developments in Li-ion chemistry enabled Li-ion batteries to replace them.