The lead-acid GTZ5S electric vehicle power supply system utilizes lead-acid batteries as its primary power source. Its primary advantages are low cost and mature technology. Lead-acid batteries also boast long lifespan and easy maintenance compared to lithium-ion batteries; however, their lower energy density means they store less power per weight when compared against lithium-ion alternatives and they charge slowly due to lower efficiency at charging. Overall, while some aspects may present challenges in regards to reliability or cost, its low costs make this option attractive in certain applications.