AirTags are designed to last for about a year before their batteries die, but, again, they might be too. If you only take an AirTag out every few months or so, your AirTag is slowly burning through a battery you don't actually need to be using. Unfortunately, you can't put an AirTag into standby mode, or enable something like a Low Power Mode. Instead, consider removing the battery for any AirTags that aren't frequent fliers. What you discover the battery on the front of their AirTag to keep it ready to go when they need it.
