How long should I charge ZeFit2 for the first time ? August 11, 2015 10:36 Updated We recommend charging it during 1:30 to 2 hours. Related articles How long does the battery last after a full charge? After I remove ZeFit2 from its charger, ZeFit2 screen remains stuck on the battery icon? Can I charge my ZeFit2 with a wall plug ? ZeFit2 is not charging, no battery indicator shows up? 3. How to update your ZeFit2 ?