The heavy metal known for its use in batteries is lead. Lead is primarily utilized in lead-acid batteries, which are widely used in automobiles, uninterruptible power supplies, and other applications requiring reliable energy storage. One of the advantages of lead-acid batteries is their ability to deliver a high surge current, making them effective for starting vehicles. However, the toxicity of lead poses environmental and health risks, leading to regulated disposal and recycling practices. Advances in battery technology are gradually moving towards alternatives like lithium-ion batteries, but lead acid remains a significant part of the energy landscape due to its cost-effectiveness and established infrastructure.