The last time my watch went flat and I tried to charge it I could not get it turn on. I tried various cables, power points, cleaned the pins and still nothing. I was ready to return it when I read in another forum to try holding the top left button for 20 seconds which also did nothing. I was playing around and double tapped the top left button and all of a sudden the watch was back on showing an 86% charge. Not sure what happened but wondering if anyone has had a similar experience.