The battery life on the Garmin Fenix 6x Pro Solar Titanium is excellent. The watch can be used in regular mode for up to 25 days, or it can be used in GPS mode for up to 15 hours. This means that you can go for a long hike or bike ride without having to worry about your watch running out of power. And if the battery does start to run low, you can use the solar panel on the side of the watch to recharge it quickly.