@Cuba1hr Hi, I also switched from V800 to S9baro since November. V800 is unbelievable, without training I charge my watch every 30 days! S9baro have pulse measurement off, standby on, 2-3 times weekly exercises each lasting 1 hour 20min. I charge the watch after 10 to 12 days. I also wonder if we can check the history of our watch by serial number.