A cell phone battery may need to be replaced when its performance deteriorates significantly, resulting in shorter usage times and more frequent charging. As batteries age, they lose their ability to hold a charge due to chemical reactions within the battery cells, leading to issues such as unexpected shutdowns, overheating, or devices failing to turn on. Additionally, if the battery swells, it can damage the phone's internal components and screen. Regularly monitoring battery health through device settings can help identify when replacement is necessary to ensure optimal device functionality.

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