Same again here. I've been using my 42mm Galaxy watch for a couple of weeks now. I managed to improve the battery life from half a day by turning off the heart rate check, wifi and GPS, but not to more than 15 or 16 hours. How long I get also seems to depend a lot on the watch face I pick. If the face I use has a good dim mode I might get to bedtime without charging. Even more alarming is that my watch has started to heat up this afternoon. It was warm when I took it off the charger this morning, which I didn't stop to think about, but this afternoon, it's warming up while on, and there are no apps running besides the bluetooth and the watchface.
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