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How much does the display brightness setting affect the battery life of the Suunto EON Core?

The Suunto EON Core default brightness is 50%.
Increasing or decreasing the bightness can, accordingly, reduce or extend the battery life by approximately 30%. This is only a rough estimate as other factors, such as temperature, can also affect battery life.

See also the Suunto EON Core user guide sections:
Display brightness
Technical specifications - Battery

Suunto EON Core