How can I tell when my smartwatch is charging? A lightning bolt will be visible on the watch screen. You can also swipe down to see a lightning bolt next to your battery percentage. Additionally, a circle indicator will appear on the screen show the percentage of charge. Related articles I've placed the smartwatch onto the charger. Why do I not see the charging indicator on the display? Why is my watch not charging even though it is attached to the charger? How long does it take to charge my battery? How do I power on my Smartwatch? B620 Manual