One of the main factors that affect the price of lithium-ion batteries is the cost of materials. Lithium-ion batteries are made up of several components, including lithium, cobalt, nickel, and other metals. The cost of these materials can vary depending on supply and demand. For example, when there is high demand for lithium, the price of this material can increase, leading to higher battery prices. Additionally, some manufacturers use higher quality materials in their batteries, which can also drive up the price.