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SLI Battery Market: Global Industry Analysis and Forecast (2021-2027) The SLI Battery stands for Starting, Lighting, and Ignition battery, which is a lead-acid and rechargeable battery, which is generally used for automobiles and in internal combustion engines. The SLI battery aims to start the engine in all-weather situations and to ensure operation in the case of an onboard electrical recharging type failure, allowing the auxiliary electrical equipment to function normally for a length of time. The SLI battery is generally considered a high-power-consuming battery with a lifespan of 3-6 years. In this type of battery, 6 cells are stacked together in an electrolytic fluid containing sulphuric acid to provide a voltage output of 12V. It works at a wide range of temperatures and provides various advantages, such as high current discharge, low internal resistance, and ultra–long life with a cycle life of more than 100000 times.