HOW LONG WILL MY SMARTWATCH BATTERY LAST? Rachel Updated October 26, 2017 16:40 Follow Your battery will last up to 24 hours, depending on usage. Related articles HOW DO I CONSERVE THE BATTERY LIFE? HOW DO I CHARGE MY SMARTWATCH? HOW DO I INSTALL/REPLACE THE BATTERY? HOW LONG DOES IT TAKE TO CHARGE MY BATTERY? HOW CAN I TELL WHEN MY SMARTWATCH IS CHARGING? Comments 0 comments Please sign in to leave a comment.