Do Garmin watch faces drain the battery?
It is the first question in every Connect IQ thread: will this face eat my battery? The answer is that it depends on how the face is built, and the price tells you nothing. There are free faces with no noticeable drain and five-dollar faces just the same. How it is built decides, not the listing.
What actually costs power
Four things cost power, in order of impact.
Lit pixels. On an AMOLED panel, brightness is current. A face with a pale background lights every pixel of the display all day; the same layout on black lights only the glyphs. This is the single biggest difference between two faces that look equally busy.
The always-on view. A face that keeps half its layout when your wrist is down spends power once a minute, all day, whether you look or not. A face that drops to time and date spends a fraction of it. If you want both battery and always-on, this is the setting to look for.
Live data. Weather, sunrise and sunset, anything pulled through the phone: each of those is a request, and requests wake radios. Most well-built faces cache and refresh on a schedule. A face that shows live weather on a minute tick is doing something wrong.
Redraw cost. Complicated vector drawing on every tick is expensive; precomputed graphics are cheap. You cannot see this from outside, but you can feel it: a face that makes the watch warm or makes the display stutter when you raise your wrist is doing more work than it needs to.
Burn-in is the real risk, not runtime
A badly built face costs you hours of battery. A badly built always-on view can cost you the panel. There are documented cases of Garmin AMOLED watches with permanent ghosting after years of always-on use, where static labels stayed faintly visible on a screen that should have been showing something else, and at least one report of the same effect on an older MIP display.
Garmin's platform rules are the defence: in always-on mode a face may update only once a minute and may light only around ten per cent of the display, measured as luminance on current devices. On Venu and Venu Sq hardware no pixel may stay lit longer than three minutes, which is why serious always-on layouts shift position. A face that breaks the rule does not warn you; the watch simply turns always-on off for it.
How to judge a face in five minutes
Install it, then look at four things before you keep it.
Is the background black or near black? Does the always-on view drop to the essentials, or does it keep colour and data? Does the time stay readable at arm's length without turning your wrist? And after a day of normal use, is your battery percentage roughly where it usually is at that hour?
The last one is the only real measurement, and it needs a day, not a screenshot. Compare against the stock face you were using, on the same watch, in the same week. Anything else is impression.
How Umbra is built
Umbra runs a black background and an always-on view of time and date only, which is the cheap configuration. We measured it in the simulator, not over weeks on the wrist, so neither the store listing nor this article gives a percentage. If you want the configuration that costs least while still showing something, it is the same on any face: black background, always-on limited to the time, live data off unless you actually read it. Umbra ships set up that way, and so do several of the good free faces in the store.