Battery testing is the process of evaluating the performance and safety of batteries, which are essential for powering various devices, from smartphones to electric vehicles. This testing helps determine a battery's capacity, charge cycles, and overall lifespan, ensuring it meets industry standards and user expectations. During battery testing, various methods are employed, such as discharge tests and charge retention tests, to assess how well a battery holds and delivers energy. Additionally, safety tests check for issues like overheating or leakage, which can pose risks. Proper battery testing is crucial for manufacturers to ensure reliability and safety in their products.