How long will my smartwatch battery last on my Gen1 Smartwatch? Your battery will last up to 24 hours, depending on usage. Related articles Why is my battery draining faster than predicted on my Gen1 Touchscreen Smartwatch? How long will my watch battery last? How do I conserve battery life? How long does it take to charge my battery? How long does each battery mode last on my Gen1 Touchscreen Smartwatch?