Let me tell you about the comparison between the life span of Tang Shallow and Varta: Tang Shallow and Varta are both famous battery brands, each with its own characteristics and advantages. Generally speaking, VALTA battery life is longer, can reach 5-6 years, while the life of TangSha battery is 3-4 years. The difference in life span may be related to design, manufacturing process, materials and usage. Selection should be evaluated on a case-by-case basis. Regardless of which battery is selected, proper use and care, regular inspection and maintenance are critical to ensure optimal performance and extended life.