I have during the last month tested the Garmin Instinct Solar and in this article you can read about my experience with the outdoor-watch which in principle has an endless battery life.
Garmin's latest Instinct Crossover has a whopping 70-day battery life
Garmin Instinct 2 Solar smartwatch review
Garmin Instinct 2S Solar not showing heart rate very often : r/Garmin
Garmin Instinct Solar Tactical Outdoor Watch Review - Outdoorguru
Garmin Solar Instinct Watch Review
Garmin Instinct 2 Solar review: Rugged, colorful, long lasting, and fit for all
Watch Review: Garmin Instinct Crossover Solar Tactical Smartwatch
Garmin Instinct 2X Solar watch review: This fitness tracker has a place in the sun
Tactical Edition, Coyote Tan
Instinct® 2X Solar - Tactical Edition
8 Best Hiking and Backpacking Watches of 2024
Garmin Instinct Review. Tough AND smart. - S&S Archery
Garmin Instinct 2 GPS Watch Review