How long should I charge ZeClock for the first time? January 29, 2015 16:23 We recommend charging it during 1:30 hour. Related articles I have plugged ZeClock to my computer but it seems that it is not charging… no battery indicator shows … I cannot turn on my ZeClock… How can I change the quartz watch battery ? Can I wear ZeClock while swimming / showering? My ZeWatch3 shows incorrect time, what can I do?