So I've only had the S5 since yesterday. After running down the battery today playing with it, I plugged it in to charge. The thing is that it seems to be charging REALLY fast (a percentage point a minute at least). And the screen/back are quite warm. I'm just using the included charger and cable. Maybe this is normal, but my old phone charged much more slowly than this and I want to make sure I'm not frying the battery/internals.