Update 2. Downgraded to 4 stars. The battery life is still okay, but the battery indicator is off. I don't know how else to describe it other than the battery "using" 2% some days and "using" 25% or more other days. Battery life is still around 6-7 days, but the readings don't show the expected gradual decline. This is perhaps the most annoying problem with watches. All other features continue to work as expected. Currently on day 6 with 26% left. Update 1: The clock still works as expected for the most part. My typical usage can typically provide 6-7 days of battery life. One point I noticed is that the watch occasionally (once every 10 days) drains its battery. Drop about 40% in a few hours. I notice that restarting the watch fixes the problem. It's annoying, but doesn't bother me. Initial review: The battery life of this watch is as expected (4-5 days). With clock + hour (no GPS, music, heart rate) it uses 12-15% battery per day. The pulse of an ox while sleeping (approx. 8 hours) burns an additional 10% per day. It is also very important to turn off the second hand if you want to conserve battery life. Refreshing the screen every second also eats up the battery. I think the watch used about 5% of its battery in the first 3-4 hours before I turned off the second hand. However, it's likely that some battery life issues are due to either user error or high expectations. In terms of functionality, the pedometer is small. The watch counts about twice as many steps as I actually do. In the few workouts I've done, it takes me a minute to remember which button to pause/move to the next set. I know there are only two buttons, but I've accidentally interrupted my workout more times than I care to admit. I had to reset the watch multiple times when trying to mess with the watch face settings. The touch function always thought that instead I touched the screen to actually try to scroll through the menu items. It took a minute for the GPS to lock up. You must be outside trying to get a GPS signal if you're hoping to get a signal quickly. The GPS was very accurate in tracking my activity. I don't think the sleep tracking feature is what I expected. If you lie in bed for a while after waking up, the watch thinks that you are still in a light sleep phase. The GPS was very accurate in tracking my activity. I don't think the sleep tracking feature is what I expected. If you lie in bed for a while after waking up, the watch thinks that you are still in a light sleep phase. The GPS was very accurate in tracking my activity. I don't think the sleep tracking feature is what I expected. If you lie in bed for a while after waking up, the watch thinks that you are still in a light sleep phase.
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