What are two indications that a mobile device battery needs to be replaced?

A mobile device battery that is leaking is a clear and serious indication that it needs to be replaced. Leakage can occur due to damage or wear and tear, which can pose safety risks such as chemical exposure or potential fires. When a battery leaks, it can also damage the internal components of the device, leading to further issues beyond just the battery itself.

Additionally, overheating is another significant sign that a battery should be replaced. If a battery is overheating, it may indicate a malfunction or deterioration, raising safety concerns and the potential for swelling or other damage. Both leaking and overheating point to serious issues with the battery's integrity and functionality, indicating that replacement is necessary to ensure safe operation and optimal performance of the mobile device.