What a watch face actually does all day
In normal wear, Connect IQ wakes the active face once per minute, the face draws the screen, and everything sleeps again. That is the whole job, and it is deliberately cheap; Garmin designed the platform so a watch face cannot casually ruin the multi-week battery life the watch is sold on. When you raise your wrist, the face gets a short high-power window (this is when live seconds tick), then drops back to the once-a-minute rhythm.
So where do the horror stories come from? From the exceptions: things a face can do, or you can enable, that break out of that cheap rhythm.
The four real battery costs, ranked
| Cost | Who controls it | How much it matters |
|---|---|---|
| Always-on display | You, in watch settings | The big one on AMOLED watches; applies to built-in faces too |
| Seconds always visible | You, in face settings | 60 redraws per minute instead of 1; noticeable over a day |
| Careless drawing code | The face developer | Loading images or fonts on every redraw instead of once at start; the classic sin of hastily built faces |
| Heavy data habits | The face developer | Polling sensors and connections more often than the data changes |
Notice that the top two are your settings, not the developer's code. That is the honest core of this topic: the most common "this face drains my watch" cases are really "I turned on always-on display and seconds at the same time I installed the face".
The one-day test
Skip the speculation. Charge the watch, run your Connect IQ face for a normal day, note the drain. Next day, same routine on a built-in Garmin face. If the difference is a few percent, the face is fine and your battery story lives elsewhere (firmware updates, GPS activities, a chatty notification day). If the difference is dramatic, you have your answer, and the developer deserves to hear it; a face that eats battery on your model is usually doing one of the two developer sins above, and both are fixable in an update.
How we build for battery, stated plainly
Our faces load every resource once at startup and never allocate while drawing, seconds default to wrist-raise only, and always-on modes draw a reduced layout within Garmin's low-power rules. We test drain against built-in faces on the same watch before shipping. That is not a promise of magic numbers, battery depends on your settings and your day, but it is why "runs like a built-in face" is the bar we aim at. A proper measured study across display types is on our roadmap, and when we publish it, the numbers will be on this site.
Frequently asked
Will deleting unused watch faces improve battery life?
Does showing seconds drain the battery?
Is always-on display the face’s fault?
How do I check whether my watch face is the battery problem?
Are paid faces more battery-friendly than free ones?
Last verified: 2026-07-18 · Connect IQ platform behavior from our own face development; drain comparisons on Fenix 8, built-in vs our faces