The term "battery replacement" refers to the process of replacing a worn out, damaged or dead battery in an electronic device such as a phone, laptop, camera or any other gadget that uses a rechargeable battery. This is usually done when the battery no longer holds enough charge, drains too quickly or won't take a charge at all. The process involves removing the old battery and inserting a new one in its place, after ensuring that the device is turned off to prevent any accidental activation while working on it.