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3 Don’t go tracking my heart While this Huawei is part of a new generation of Android Wear watches, it has the same borderline-useless scanner as most older models. Stay still and it can tell you your resting heart rate within seconds, but as soon as you start moving it will refuse to give you a reading. 4 It’s a long road The battery lasts somewhere between 1.5 and 2 days with normal use. We’re pretty pleased with how long it lasts when using GPS too – you might expect this to make the battery level drop like a stone, but it should get through a marathon even if you’re not particularly fast.