Two-wheeler lead-acid batteries are rechargeable energy storage devices used primarily for starting, lighting, and ignition (SLI) in conventional motorcycles and scooters. Market growth is driven by expanding two-wheeler ownership, particularly in developing regions, and consistent aftermarket replacement needs. Their primary strengths include exceptional affordability, robust reliability, and a highly established global recycling infrastructure. However, the market faces significant challenges, notably increasing environmental regulations and the rapid technological disruption caused by declining lithium-ion costs.