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While it varies somewhat, many people have been reporting that the fitness tracker usually lasts 5 full days on a single charge. In general, the more features a tracker has, the faster it will drain the battery. 4 or 5 days is an impressive charge compared to other trackers with similar features (continuous heart rate tracking for example). See More
Reps counting feature is not reliable, sometimes it misses few reps and with some exercises it can count 1 rap, even if you did 10 reps for example. And it can't detect when you start the exercise, so you have to start and stop the counter manually. In practice I frequently forget to start and to stop the counter so after some time I simply sopped using this feature. See More
In order to turn on the display, for example to see current time, you need to raise you hand and after some delay display some times turns on, sometimes not. Other option is to double tap the display, which requires both hands. If you frequently checking current time, it is really annoying. See More