Which is better lead acid or lithium battery for an electric wheelchair?

Lead-acid batteries are safer, but have lower capacity; Lithium batteries have greater capacity and are lighter, but are slightly less safe. Lead-acid battery (VRLA) is a battery whose electrodes consist mainly of lead and its oxide, and the electrolyte is a solution of sulfuric acid. In the discharged state of a lead-acid battery, the main component of the positive electrode is lead dioxide and the main component of the negative electrode is lead; in the charged state, the main components of the positive and negative electrodes are both lead; sulfate. "Lithium battery" is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses non-aqueous electrolyte solution. Lithium metal batteries were first proposed and studied by Gilbert N. Lewis in 1912. In the 1970s, M.S Whittingham proposed and began investigating lithium-ion batteries. Since the chemical properties of lithium metal are very active, the processing, storage and use of lithium metal are subject to very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of science and technology, lithium batteries have now become mainstream.