The font on the battery saver watch face is too small and thin.

“Rage” here, too, if you agree that generally the fonts are too thin, not just in battery saver: https://forums.garmin.com/outdoor-recreation/outdoor-recreation/f/enduro-3/383821/why-has-garmin-switched-to-a-thinner-font-on-enduro-3-vs-enduro-2-fenix-7/1829382#1829382

Or just comment it, please!

My guess is that Enduro shares this watch face with amoled devices, where smaller text draws less power. MIP screen works differently, readability is different and proper face design should be different too. Current version is quite disrespectful to people with eyesight less than perfect.

POPEJ. said:

amoled devices, where smaller text draws less power. MIP screen works differently

When it comes to power consumption, it also makes sense to use a thin/small font for a MIP display. If the display changes, a thick/large font consumes more power, as more pixels have to be updated than with a thin/small font.

Difficult to tell. Probably pixels can't be set individually and changing 1 or 100 could costs the same. And see the option for turning off display completely in settings of battery saver mode. Estimated extension of working time is +0  :)

POPEJ. said:

Probably pixels can't be set individually

A MIP display controls each pixel individually.

And only a change to a pixel consumes power.

A static pixel consumes no power. It does not matter whether it is black, white or colored.

So it stays that way. If the font is thicker, more pixels have to be changed when the display changes. For example, when the minute display changes. And that consumes more battery.
That is a fact.

POPEJ. said:

Probably pixels can't be set individually

„In a MIP display, each pixel has its built-in memory. This is a crucial aspect of the technology. The memory is typically a small amount of static RAM (SRAM) located at each pixel.“

https://review-displays.co.uk/mip-displays-and-how-they-work/ 

bluefish said:

A MIP display controls each pixel individually.

Any display does

Anyway, speculation is meaningless without numbers. See for example this display, which looks very similar to Enduro/Fenix: https://www.digikey.com/en/products/detail/sharp-microelectronics/LS014B7DD01/23349347

From datasheet: typical power consumption is 3.4uW for static screen, 14uW for 1FPS and 270uW for 18FPS. Easy to extrapolate that 1 frame per 60sec would take on average about 3.6uW. I guess, this is the best case, where pixels don't change state, but it gives some reference. For comparison, whole Enduro in battery saving mode should take about 1mW (=1000uW).

POPEJ. said:

Anyway, speculation is meaningless without numbers

You can do a very simple experiment. Use a digital watchface that continuously displays the seconds. Let it monitor the power consumption over 24 hours. Then repeat the test with the same watchface and the same conditions. The only difference: this time you deactivate the display of the seconds.
Let us know how much battery you have used in 24 hours. Once with the display of the seconds, and once without the display of the seconds.

Sure CPU will draw more power, when updating display frequently. But how is it related to font size and watch face without seconds?

POPEJ. said:

Sure CPU will draw more power, when updating display frequently. But how is it related to font size and watch face without seconds?

I thought I had already said that ?

It can also be found in the article I linked above : 

“Pixel Control: Due to the integrated memory, each pixel in a MIP display can retain its state (colour and brightness) without needing a constant refresh from the processor. This means that if the image on the screen doesn’t change, the display does not need to use power to keep the image on the screen.“

The pixels that do not change do not consume any power.

So no CPU processing power either.

For example, if a 3 becomes an 8, only some of the pixels change. The part that is retained does not consume any power, as the information is already present.

A font that is larger consists of more pixels than a smaller font. Consequently, more pixels have to be updated for a larger font.

If a fat 3 becomes a fat 8, more pixels have to change their status than with a thin 8.

As a result, a fat 3 consumes more power when it changes to a fat 8 than a thinner 3 changing to a thin 8.

To refer to the seconds: without seconds, the screen is static at this point. So it consumes no power.