The battery life of an AirTag can vary depending on usage and other factors. Apple states that the built-in battery of an AirTag is designed to last approximately one year under normal conditions. However, the actual battery life can be influenced by factors such as the frequency of location updates, proximity to the connected device, and usage patterns. In case the battery runs low, you can easily replace it with a standard CR2032 coin cell battery, which is widely available. Additionally, the Find My app on your connected device can notify you when the battery of an AirTag is running low, allowing you to replace it and continue enjoying the tracking functionality.