How long will my smartwatch battery last? Updated June 15, 2019 23:36 Follow Your battery will last up to 24 hours, depending on usage. Related articles Watch Battery Replacements How do I conserve battery life? I've placed the smartwatch onto the charger. Why do I not see the charging indicator on the display? I want to return my order Fossil Watch Warranty Comments 0 comments Please sign in to leave a comment.