The chemical element known for its use in batteries and has the symbol Pb is lead. Lead is a heavy metal that has been used for centuries in various applications, including construction, batteries, and shielding against radiation. In batteries, lead-acid batteries are widely utilized in vehicles and uninterruptible power supplies (UPS) systems, thanks to their ability to provide high surge currents and rechargeability. Despite its usefulness, lead is toxic and can cause severe health issues if ingested or inhaled, leading to regulations on its use and disposal to minimize environmental impact and human exposure.