tanivula:networkn: Interesting that the Official Samsung charger is giving me 780!
screen off or screen on? and are you using the supplied cable or a generic one. I have read there are physical differences with the supplied cable.
I had the same issue as I had a cheap cable but also had a cheap charger as well which I'm told can be bad for phone. I have an old Nokia cable that plugs into charger and it seems fine as well.