How long does the battery last after a full charge? August 11, 2015 10:37 Updated Between 3 to 5 days, depending on your daily usage. Related articles Can I charge my ZeFit2 with a wall plug ? After I remove ZeFit2 from its charger, ZeFit2 screen remains stuck on the battery icon? How long should I charge ZeFit2 for the first time ? ZeFit2 is not charging, no battery indicator shows up? 3. How to update your ZeFit2 ?