Why won't the battery charge past a certain percentage? Allow your Gen 2 watch to completely run out of battery then charge it completely. After it is at 100%, press and hold the power button until it restarts. Related articles How do I power off my Smartwatch? How do I register my watch? What third party apps are available for download on my CZ Smart Gen 2 watch? What is the Continuous Heart Rate Tracking feature within the Gen 2 Wellness watch app? My battery won’t charge past a certain percentage. How can I fix this?