Gel battery is also a type of lead-acid battery. It is an improvement on ordinary lead-acid batteries with liquid electrolytes. Colloidal electrolyte is used instead of sulfuric acid electrolyte, thereby improving safety, power storage, discharge performance and service life. At present, gel batteries are widely used in power generation, communications, automobiles, emergency lighting and other fields. Why is it so popular? Let’s analyze the technical principles of gel batteries and unveil their popularity.