Batteries are electrochemical devices in which an oxidation-reduction reaction occurs, where the anode yields its electrons (oxidizes) to the cathode, promoting its reduction (electron gain), giving rise to a process called spontaneous, where chemical energy is converted into electrical energy. This reaction ends when the oxidation electrode ends, that is, it has no more electrons to supply the reduction electrode. However, when receiving an electrical discharge, the oxidation electrode regains electrons to donate, starting a new oxidation-reduction cycle that produces electrical current. Batteries are very present in everyday life, both in power generation, as well as in electric vehicles, watches, notebooks, cell phones, etc. Thus, this work presents a discussion on the use of batteries as a source of renewable energy and what its environmental impacts are, including the emission of carbon dioxide into the atmosphere as it is used, the costs of its use and time of its useful life; this is in order to bring the reader a prior knowledge of how this energy source can be extremely beneficial to the environment, when used and disposed of correctly.
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