How long will it take to charge my Gen 2 Hybrid watch? The CZ Smart Gen 2 Hybrid watch battery can charge to at least 80% in one hour. Related articles I've placed the smartwatch onto the charger. Why don't I see the charging indicator on the display? Does my CZ Smart Gen 2 Hybrid smartwatch monitor my heart rate? What type of sleep activity is being tracked? How long will my CZ Smart Gen 2 Hybrid smartwatch battery last?