Many of us have experienced our cell phone batteries beginning to get hot as it gets older. Whether your phone begins to overheat when using it or when you charge it, that is a major sign that your battery is damaged and needs to be replaced as soon as possible. Not only is an overheating phone a sign of a damaged battery, but it can also be hazardous. If you notice that your phone begins to get hot when in use or charging, be sure to get the battery replaced right away.