The subsequent step was the nickel metal hydride batteries, technology that appeared in the late 1980s and that was a good evolution in the lead acid Batteries. They improved, above all, the specific energy figures mass and volumetric, allowing to reduce both the weight and size of the Batteries. however, and because their voltage was not higher, these batteries have been used, above all, for hybrid Vehicles. As an additional advantage of this technology is its lower environmental impact due to the elimination of Lead.
Lithium-ion Batteries have, for the time being, been the last to appear and, except for a clearly higher cost, this technology only provides advantages compared to the previous Ones. The voltage becomes twice as high as the lead acid batteries and hastra three times better than those of nickel metal hydride. The specific energy is the highest both volumetric and mass, with values that allow to reduce almost half the weight and volume of nickel metal hydride batteries. In addition, they have up to 3,000 life cycles compared to 800 of lead or 600 of nickels.
But the evolution of the batteries is not over Here. We are already studying new components that seek, first of all, to reduce the weights and the volume of these elements while improving the values of life cycles and, above all, the economic cost, as today the price of the different systems is proportional to the s advantages They provide. According to some calculations, the dollar cost of one kWh of a lead acid battery is between 100 and 125 Dollars. This cost is between 220 and 400 when it is a nickel metal hydride battery, and reaches values of between 250 and 800 dollars if we talk about Lithium-ion Batteries. For this reason even today despite the benefits that may have the other types of battery the lead-acid are those that acupan more market Quota. Still the tendency will be to get rid of these and go reemplazandolas by other less polluting batteries I with greater capacity of energy.