Persistent Garmin smartwatch battery drain: Potential causes and possible workarounds

For many Garmin smartwatch owners, "battery drain" is a familiar and frustrating issue. It describes a sudden, drastic drop in battery life that is often triggered by software updates. Given that exceptional battery life is one of Garmin’s key competitive advantages over rivals like the Apple Watch, such problems are particularly disruptive for users.

Garmin typically addresses these issues with subsequent patches. Most recently, firmware version 22.39 for the Fenix 8 lineup (Fenix 8 AMOLED on Amazon) was deployed to reduce power consumption and restore expected battery performance. However, early user feedback suggests the fix may not be fully effective. At least one user has noted that the battery drain persists even after updating to version 22.39. While this appears to be an isolated case so far, a comment from another user, Mingui, points to a potential cause. According to Mingui, recent firmware versions cause the smartwatch to maintain an active Wi-Fi connection even after it is unplugged from the charger following a Spotify playlist sync. Since Wi-Fi is highly power-intensive, this would easily explain the increased drain.

Interestingly, previous updates have shown that unintended setting changes, rather than actual code bugs, can often play a role. For example, firmware version 22.35 automatically re-enabled continuous blood oxygen saturation (pulse oximetry) measurement, which significantly increases power usage. In such cases, performing a full factory reset has often proven to be an effective workaround.